Element symbol chemical abstracts serviceNo. Al 7429-90-5 Antimony trioxide Sb203 1309-64-4 Bromobr10097-32-2 Copper Cu 7440-50-8 Epoxy resin n/a n/ An N/A Gold Au 7440-57-5 Iron Fe 7440.
Detailed explanation of chemical abstracts service number
Chemical abstracts service registration number. This article comes from: Bo Yan League Forum.
There are many websites to query, generally using google, just enter the name of the substance and CAS. This article comes from: Bo Yan League Forum.
Put it on STN to provide simplified database search. It will guide you through effective online search and make you need it faster and easier than before. This article comes from: Bo Yan League Forum.
I. Preface This article comes from: Bo Yan League Forum.
Chemical Abstracts published by American Chemical Abstracts Society enjoys the reputation of "the key to the world's chemical literature", and its contribution to chemistry and chemical literature can not be ignored. At the same time, the Chinese Academy of Sciences also developed the STN online retrieval system to meet the needs of this trend. The retrieval system includes more than 200 color databases. Among many databases, its biggest selling point is that it has a unique database-registry file, which is characterized by a powerful chemical dictionary database. It can use chemical nomenclature, chemical molecular formula and chemical structural formula to retrieve relevant information in the field of chemistry. If it is combined with other databases on STN, it will be beneficial to find references, patents, physical and chemical properties of chemicals, registration of chemicals or commercial information. This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
Second, about the registry file This article comes from: Bo Yan League Forum.
In the STN online retrieval system developed by Chinese Academy of Sciences, the registry file is the most distinctive database, which has the function of a chemical dictionary and is a database containing chemical substance identification and data collection. The registry file contains160,000 chemical substances, including more than 20 million chemical names. At the same time, it can search data by chemical name, chemical molecular formula or structural formula, and it also provides a powerful chemical registration number (CAS RNS) as the only authoritative entry for querying complex chemical substances. Let's first introduce what is CAS RNs. A unique and specific number for a chemical substance, just like the ID number of a chemical substance. Each compound may have many different names, named after the universal IUPAC. 4. Take 4 '- sulfonyldiphenylamine as an example, the trade name is Avlosulfon, the experiment name is NSC 609 1, then the CA index is named aniline, 4,4'-sulfonylbissulfonyl bis-,and other names are as follows: 1, 1 '- sulfonylbis [4-] Among so many names, if you use a single name to query data, the problem of incomplete data collection will inevitably occur. But in this example, the chemical registration number is 80-08-0. Using this unique information to retrieve data can save a lot of energy and time, and at the same time, the data collection will be more complete. CAS RNs not only appear in books or databases published by CAS, but also are used to represent chemicals in other publications or databases, such as Merck Index, Aldrich Catalog, Chem Sources, Dictionary of Organic/In Organic Compounds and periodical Angewandte Chemie. At the same time, at present, when the customs import and export chemicals, it also requires the information of chemical registration number, which shows its importance. This article comes from: Bo Yan League Forum.
Let's first understand what is called CASRNS-chemical registration number, which is arranged in nine numbers at most and divided into three groups. The outside is represented by aaaabb-bb-b, and the part of the number B is fixed, that is to say, the front part must have at least two codes and at most six codes. The numbers here can show the old and new contents of a chemical. In principle, the more RNs, the more new compounds. There is another way to check the correctness of CAS RNs: This article is from Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
Among them: This article is from Bo Yan League Forum.
N:CAS RNs except the check number, other numbers are entered from right to left. This article comes from: Bo Yan League Forum.
R: Look up the number. This article is from Bo Yan League Forum.
For example: 7732- 18-5 This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
The following is the information format provided by the registry file: This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
Third, the use of chemical naming to retrieve information This article comes from: Bo Yan League Forum.
If there is a complete compound name, we can use naming to retrieve information. Here is an example to find the patent literature on the synthesis of 5- chlorobenzotriazole compounds: This article comes from: Bo Yan Union Forum.
This article comes from: Bo Yan League Forum.
File Registration This article comes from: Bo Yan League Forum.
E 5- Chlorobenzotriazole /CN This article comes from Bo Yan League Forum.
E 1 1 5- chlorobenzothiophene -2- formaldehyde /cn This article comes from: Bo Yan League Forum.
E 2 1.5- chlorobenzothiophene -2- methyl /cn This article comes from: Bo Yan League Forum.
E3 1->； 5- Chlorobenzotriazole /CN This article comes from: Bo Yan League Forum.
E4 1 5- chlorobenzoxazole /cn This article comes from: Bo Yan League Forum.
E 5 1 5- chlorobenzoxazole -2- formaldehyde /cn This article comes from: Bo Yan League Forum.
E 15- chlorobenzoxazolone /cn this article comes from: Bo Yan league forum.
E 7 1 5- chlorobenzoxazolone /cn This article comes from: Bo Yan League Forum.
E8 1 5- chloro ring (2.2. 1) heptyl -2- ene /cn This article comes from: Bo Yan League Forum.
E9 1 5- chloro-ring (2.2. 1) heptyl -2- ene polymer /cn This article comes from: Bo Yan Union Forum.
E 10 15- chloro ring (3.2.0) heptyl -2- ene /cn This article comes from: Bo Yan League Forum.
E 1 1 15- chloro-bis (1, 5- cyclooctanediamine) diiridium /cn This article comes from: Bo Yan Union Forum.
E 12 15- chloro calicene/cn This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
=>S E3 This article comes from: Bo Yan League Forum.
L 1 1 5- chlorobenzotriazole /cn this article comes from: Bo Yan league forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
S L 1/P This article comes from Bo Yan League Forum.
L2 1 1 L 1/P This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
=>S L2 and P/DT This article comes from: Bo Yan League Forum.
2394686 P/DT This article comes from Bo Yan League Forum.
L3 5 L2 and P/DT This article comes from Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
=>D L3 suspenders ABS 1 This article comes from: Bo Yan Union Forum.
This article comes from: Bo Yan League Forum.
L3 answer 1 of 5 CA plus copyright 1998 ACS This article comes from: Bo Yan League Forum.
AN 1989:457739 CAPLUS This article comes from: Bo Yan League Forum.
DN111:57739 This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
1- hydroxy benzotriazoles This article comes from: Bo Yan League Forum.
In Lin, Botai; Maekawa, Tsukimoto This article comes from: Bo Yan League Forum.
Otsuka Chemical Co., Ltd. This article comes from: Bo Yan Union Forum.
Sojpn。 Kokai Tokkyo Koho, 6 pages in total. This article comes from: Bo Yan League Forum.
CODEN: JKXXAF This article comes from: Bo Yan League Forum.
Pijp01019073a219890123 Heisei This article comes from: Bo Yan League Forum.
Aijp87-17540619870714 This article comes from: Bo Yan League Forum.
DT Patent This article comes from: Bo Yan Union Forum.
This article comes from: Bo Yan League Forum.
AB benzotriazole I (r = h; R 1-R4 = h, halo, the stable group in the reaction This article comes from: Bo Yan League Forum.
Solution) (2) No by-products of colored substances, useful This article comes from: Bo Yan League Forum.
As a mirror and stabilizer for polymers (no data). This article comes from: Bo Yan League Forum.
High yield treatment of 1- hydroxybenzotriazole I (r = OH) This article comes from: Bo Yan Union Forum.
(iii) or their salts (compounds) with lead. ) In acid medium, choose this article from: Bo Yan League Forum.
In the presence of metals, the wholesale tendency is greater than this article from: Bo Yan Union Forum.
Pb。 Amixt。 65438+ o-hydroxybenzotriazole, lead, aluminum and H2O are stirred. This article comes from: Bo Yan League Forum.
Photos of adding AQ drop by drop at100. Hydrochloric acid solution. Over 2 h, this article comes from: Bo Yan League Forum.
Reaction mixture. It was further stirred for 5 h, giving 99% of this article from: Bo Yan League Forum.
Benzotriazole, compared with 64% of the control without addn. Lead content. This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
Fourth, the use of chemical molecular formula to retrieve information This article comes from: Bo Yan League Forum.
There are not many databases that can use molecular formulas to retrieve compound data, but REGISRTY FILE can complete data collection through very simple steps. Among them, the retrieved molecular formula arrangement must meet the requirements of Hill system order. Here, first introduce the rules of Hill System: This article comes from: Bo Yan League Forum.
1. For a single compound: This article comes from Bo Yan League Forum.
1. If the compound does not contain element C, search for elements in alphabetical order, such as H2SO4 → H2O4S. This article comes from: Bo Yan League Forum.
2. If the compound contains element C, arrange element C first, then element H, and arrange other elements in alphabetical order, such as C9H8CL4N8O. This article comes from: Bo Yan League Forum.
Two. For multi-component compounds: This article comes from: Bo Yan League Forum.
1. In the composition, one component contains element C, and the other component does not: arrange the components containing element C first, and then arrange the components without element C. The arrangement of each group of elements is the same as the previous I- 1 and I-2 rules, such as C4H8N2O4.H2O This article comes from: Bo Yan League Forum.
2. Each component in the composition contains element C: firstly, according to the number of element C in each group, the component with more element C ranks first and the component with less element C ranks second; If the number of C elements of each component is the same, the priority is determined according to the H element of each component; If the C and H elements in each group are the same, the priority will be determined according to the alphabetical order of the first element among the other elements in each group. The arrangement principle of each group of elements can be arranged according to the previous I- 1 and I-2 rules, such as C2H4 Cl2, C2H4 F2, C2CLF5 and CHCLF2. This article comes from: Bo Yan League Forum.
3. When the multi-component is a polymer: if it is a homopolymer, the arrangement of elements should be arranged according to the rules of I- 1 and I-2, and then an X symbol should be added outside the brackets, such as (C8H8) X; If it is a copolymer, the components should be arranged according to the rules of II-2, and then an X symbol should be added to the brackets, such as (C4H6O2. C2H3C L. C2H3f) X. This article comes from: Bo Yan League Forum.
4. If it is a salt: if it is an acid salt, replace the metal with H in its molecular formula, and then mark the metal element with a semicolon. For example, sodium acetate is represented by C2H4O2. NA； For the amine salt, the H element in the amine salt is transferred to the anion in the molecular formula, so that the compound is expressed in a neutral way. For example, trimethylammonium chloride is represented by C3H9N.CLH. This article comes from: Bo Yan League Forum.
In many compounds, different compounds will have the same molecular formula because of the relationship between isomers, so using molecular formula to search data will get non-unique results, and then we must search together with the names of compounds to narrow down the search results. The following example is to search data by molecular formula and get three different isomeric compounds. At this time, only matching names can narrow the search results. In this case, the naming must use the unique fragment name of the required compound to retrieve the unique compound. If there are too many results in searching a compound with molecular formula, it is not suitable to search data with molecular formula. At this time, it is appropriate to use the structural formula of the compound as the retrieval method. The following example is to use the molecular formula to inquire about the information of 2,5-dinitro-3,4-dibromothiophene compounds: This article comes from: Bo Yan Joint Forum.
This article comes from: Bo Yan League Forum.
=> file registration This article comes from: Bo Yan League Forum.
=>E C4BR2N2O4S/MF This article comes from: Bo Yan League Forum.
E 1 1 C4BR2N2/MF this article comes from: Bo Yan league forum.
E2 1 C4BR2N2O2/MF This article comes from: Bo Yan League Forum.
E3 3->； C4BR2N2O4S/MF This article comes from: Bo Yan League Forum.
E42c4br2n22s/MF This article comes from Bo Yan League Forum.
E5 2 C4BR2N4NBO4/MF This article comes from: Bo Yan League Forum.
E6 2 C4BR2N4NBS4/MF This article comes from: Bo Yan League Forum.
E7 2 C4BR2N4PT/MF This article comes from Bo Yan League Forum.
E81c4br2n4pt.2ch5n3.xh2o.2h/MF This article comes from: Bo Yan League Forum.
E9 2 C4BR2N4PT.2H/MF This article comes from Bo Yan League Forum.
E101c4br2n4pt.2h2o.2k/MF This article comes from: Bo Yan League Forum.
E111c4br2n4pt.2h2o.2na/mfThis article comes from: Bo Yan League Forum.
E 12 2 C4BR2N4PT.2K/MF this article comes from: Bo Yan league forum.
This article comes from: Bo Yan League Forum.
=>S E3 This article comes from: Bo Yan League Forum.
L 1 3 C4BR2N2O4S/MF this article comes from: Bo Yan league forum.
This article comes from: Bo Yan League Forum.
=>d Scan This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
L 1 3 Answer Registry Copyright 1 998 ACS This article comes from: Bo Yan League Forum.
Among thiophene, 2,5-dibromo-3,4-dinitro -(6ci, 7ci, 9ci) This article comes from: Bo Yan Union Forum.
MF * * * C4 Br2n2o4s * * This article comes from: Bo Yan League Forum.
CI COM This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
How many more answers do you want to scan? (1): 1 This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
L 1 3 Answer Registry Copyright 1 998 ACS This article comes from: Bo Yan League Forum.
Among thiophene, 2,4-dibromo-3,5-dinitro -(7ci) This article comes from: Bo Yan League Forum.
MF * * * C4 Br2n2o4s * * This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
How many more answers do you want to scan? (1): 1 This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
L 1 3 Answer Registry Copyright 1 998 ACS This article comes from: Bo Yan League Forum.
Among thiophene, 3,4-dibromo-2,5-dinitro -(6ci, 9ci) This article comes from: Bo Yan Union Forum.
MF * * * C4 Br2n2o4s * * This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
All answers have been scanned. This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
=>S L 1 and 2,5-dibromo This article comes from: Bo Yan League Forum.
3578032,5 This article comes from: Bo Yan League Forum.
109536 DIBROMO this article comes from: Bo Yan league forum.
2724 2,5-Dibromide This article comes from: Bo Yan League Forum.
(2,5 (w) dibromo) This article comes from: Bo Yan League Forum.
L 2 1l 1 and 2,5-dibromo This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
= & gtdllide This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
L2 Answer 1 of 1 Registry Copyright 1998 ACS This article comes from: Bo Yan League Forum.
RN 5243 1-30-8 Registration Form This article comes from: Bo Yan League Forum.
Cn * * * thiophene, 2,5-dibromo-3,4-dinitro -(6ci, 7ci, 9ci) * * * (ca This article comes from Bo Yan League Forum.
Index Name) This article comes from: Bo Yan League Forum.
Other names: This article comes from: Bo Yan League Forum.
CN * * * 2,5-dibromo-3,4-dinitrothiophene * * * This article comes from: Bo Yan League Forum.
FS 3D CONCORD This article comes from: Bo Yan League Forum.
MF * * * C4 Br2n2o4s * * This article comes from: Bo Yan League Forum.
CI COM This article comes from: Bo Yan League Forum.
Lcstn documents: beilstein *, ca, caold, caplus, chemcats, cheminforrx, this article comes from: Bo Yan League Forum.
Cschem, ficdb, ifipat, ifiudb, specinfo, toxlit, uspatfull This article comes from: Bo Yan League Forum.
(* File contains digitally searchable property data) This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
12 quotes file ca (1967 till now) This article comes from: Bo Yan League Forum.
12 Cites the document ca plus (1967 till now). This article comes from: Bo Yan League Forum.
3 reference document caold (before1967) This article comes from: Bo Yan League Forum.
This article comes from: Bo Yan League Forum.
5. Using chemical structural formula to retrieve information This article comes from Bo Yan League Forum.
-STN online retrieval system software STN Express has powerful chemical structure drawing function. It can draw the chemical structural formula first and then search the information online. The structural formula can be selected in many ways, which will be discussed below. It can quickly and accurately find out the information of the compound to be inquired, and is most suitable for inquiring the synthesis information of new compounds. If it is combined with Markush structure retrieval, the patent information of new compound synthesis will be collected completely, which is a very powerful function of STN online retrieval system, but the retrieval cost is also expensive, which is also a factor to be considered when retrieving information. The following figure is the interface of STN Express software: This article comes from Bo Yan Alliance Forum.
There are four different types of retrieval options for STN Express's software for drawing chemical structural formulas, and the cost is shown in the following table: This article comes from: Bo Yan Union Forum.
The result range of retrieval by retrieval instruction type (USD) This article comes from: Bo Yan League Forum.
EXACT is completely consistent with the drawn structure, including its isotopes, stereoisomers, monomer polymers, free radicals and charged compounds. 39.00 This article comes from: Bo Yan League Forum.
The family contains not only the exact, but also its salts, mixtures and its polymers. 44.50 This article comes from: Bo Yan League Forum.
SSS includes not only EXACT and FAMILY, but also all other structural formulas related to the substitution and extension of different functional groups. 1 13.50 This article comes from: Bo Yan League Forum.
As can be seen from the above table, it is very expensive to retrieve data through the structural formula of compounds, but it also has its own uniqueness. In addition to accurate structural retrieval, further retrieval can be carried out with the following special functions: This article comes from: Bo Yan Union Forum.
1. variable: With this function key, you can search for substituents with the same or the same family and unique symbols; Where X represents all halogen atoms, A represents all atoms except hydrogen, Q represents all atoms except hydrogen and carbon, M represents all metal atoms, Cb represents carbocyclic compounds, Hy represents heterocyclic compounds, Ak represents straight bond carbon compounds, and so on. This article comes from: Bo Yan League Forum.
2.g- group: Many different substituents can be defined at the same position, and different substituents can be found on the same body only by drawing the structure once. This article comes from: Bo Yan League Forum.
3. Variable connection point: For cyclic compounds, if the compounds may have ortho, meta or para substitutions at the same time, STN Express software can find out the substituted compounds at different positions in the same structure. This article comes from: Bo Yan League Forum.
4. Define repeating groups: STN Express software can define that when an atom or a group of atoms with the same structure are arranged together at the same time, it can be searched by its definition function, in which the number of repeating substituents can be between 0 and 20 units.