Descriptors and Terms Used in Stereochemistry

Position of bonds and substituents in the chair and boat conformations of cyclohexane a = axial, e = equatorial, b = bowsprit, and f = flagpole. 

C- Abbreviation for cis- (obsol.). Extensively used, with elaboration, in Beilstein. 

Cp tp catp Prefixes used in Beilstein to indicate cis- and trans- in a Fischer diagram (cat refers to the end of a chain, cat = catenoid). Not used elsewhere. 

Organic Chemist s Desk Reference, Second Edition 

D- A configurational descriptor. Fuller description given above. Dj and Dq referred to configurations relative to serine and glucose, respectively (obsol.). 

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