what is the special isoprene rule?

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what is the special isoprene rule?..

Answer / swapna

Terpenoids are made up of varying number of respective
units called isoprene units(C5H8).this is isoprene rule.


Isoprene spatial type of arrangement is found to be present
in nearly all terpenoids.
Ingold in 1925 formulated this observation underanother
rule the SPECIAL ISOPRENE RULE.


According to this rule isoprene units in terpenoids are
usually joined in head-tail linkages or 1,4 linkages.
(branched end of isoprene unit considered as head.

Is This Answer Correct ?    76 Yes 7 No

what is the special isoprene rule?..

Answer / kani

this Special Isoprene Rule(SIR) was proposed by Ingold in 1925.
it states that" isoprene units in the terpenoid are linked together".
branched portion of isoprene unit is head and unbranched one is tail.
as per special isoprene rule the isoprene units are linked in head to tail fashion.

c c
/ : /
c-c-c-c- c-c-c-c
:

head tail head tail



eg: myrcene, linonene, cadinene,abietic acid etc

exceptions to the SIR: cyrtone, lavandulol etc

cryptol has 9 C atoms and cannot be divided into two isoprene units.

lavandulol is linked tail to tail.

Is This Answer Correct ?    21 Yes 8 No

what is the special isoprene rule?..

Answer / anoopa

  Isoprene rule states that," Terpenoids are made up of isoprene units (C5H8)"


The special isoprene rule describe the head to tail(1-4) linkage structure of isoprene units in terpenoid molecules.The branched portion acts as head whereas the unbranched portion as tail.

Is This Answer Correct ?    13 Yes 1 No

what is the special isoprene rule?..

Answer / britni

that isoprene units in a terpene are linked together with
the branched portion being the head and the unbranched
portion being the tail

Is This Answer Correct ?    7 Yes 1 No

what is the special isoprene rule?..

Answer / riaz sarkar

The structure of terpenes is based on a basic building block of five carbon atoms. this is called the isoprene rule.

Is This Answer Correct ?    2 Yes 2 No

what is the special isoprene rule?..

Answer / anju verma

The skeleton structure of all naturally occurring terpenoids can be built up of isoprene units.,this is knows as the isoprene rule..

Is This Answer Correct ?    0 Yes 2 No

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