exocyclic double bond

exocyclic double bond

[¦ek·sō¦sī·klik ¦dəb·əl ′bänd]
(organic chemistry)
A double bond that is connected to and external to a ring structure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In HMBC spectrum of 3 H-7 ( 6.28) was found to interact with the carbons at 38.6 (C-1) and 157.9 (C-6) and 143.1 (C-5) whereas aliphatic H-8 ( 2.74 and 2.45) showed HMBC correlation with the carbon at 124.9 (C-7) that further confirmed the position of exocyclic double bond between C-6 and C-7.
The rate of diminution on exocyclic double bond, during photolysis, is faster for longer aliphatic chain containing polymers than shorter aliphatic chain containing polymers [25] attributed to folding tendency of methylene units present in the polymer chain.
Photolysis studies of various methylene spacer containing polymers revealed that the rate of photocrosslinking of exocyclic double bonds of the polymers increases in the following order: ethylene < tetramethylene < hexamethylene < octamethylene < decamethylene.