INDEX structural formulas

Produces a monthly document containing a bibliographical-abstract section, a keyword in context section, a molecular formula index, cross-reference indexed structural formulas appear with abstracts... 

The Institute for Scientific Information (ISI), besides publishing Current Contents (p. 1611) and the Science Citation Index (p. 1637), also publishes Index Chemicus (formerly called Current Abstracts of Chemistry and Index Chemicus). This publication, begun in 1960 and appearing weekly, is devoted to printing structural formulas of all new compounds appearing in more than 100 journals, along with equations to show how they were synthesized and an author s summary of the work. Each issue contains five indexes author. 

As shown by the first prompt there are four types of search, of which we will discuss two exact and substructure (SSS). In an exact search, only information regarding exactly the stracture given will be retrieved, but even so there may well be several answers, because CA treats stereoisomers and isotopically substituted compounds as separate answers. At the conclusion of the search the system gives the number of answers, (e.g., 4). We may now look at the four answers by using the display command. As in the CA File, there is a choice of display formats, but if we choose SUB we will get (1) the Registry Number, (2) the approved CA index name, (3) other names that have appeared in CA for that compound, (4) a structural formula, and (5) the number of CA references since 1967, along with a notation as to... 

There are two indices, an index of chemicals and a general index. In the chemical index, boldface page numbers refer to the sketehes of structural formulas or to reaction equations. 

A major objective of this chapter is to outline the principal system by which colorants are classified, namely the widely accepted Colour Index classification. After tracing the developments from which this system has evolved [12,13], the distribution of existing dyes and pigments among the various classes listed therein will be introduced. Each of these classes will be discussed in turn, illustrated by structural formulae. 

The concept of the molecular connectivity index (originally called branching index) was introduced by Randic [266]. The information used in the calculation of molecular connectivity indices is the number and type of atoms and bonds as well as the numbers of total and valence electrons [176,178,181,267,268]. These data are readily available for all compounds, synthetic or hypothetical, from their structural formulas. All molecular connectivity indices are calculated only for the non-hydrogen part of the molecule [269-271]. Each non-hydrogen atom is described by its atomic 6 value, which is equal to the number of adjacent nonhydrogen atoms. For example, the first-order Oy) molecular connectivity index is calculated from the atomic S values using Eq. (38) ... 

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