Pimaric acids

The representatives of a group of natural substances are called pimaric acids . It is tricyclic diterpene - carboxylic acids , consisting of four isoprene units . They differ in the absolute configuration of their stereocenters and in the position of the double bonds .

Representative

Pimaric acids
Surname	(+) - pimaric acid	Sandaracopimaric acid	Isopimaric acid	Levopimaric acid
Structural formula
other names	(1 R , 4a R , 4b S , 7 S , 10a R ) -7-ethenyl-1,4a, 7-trimethyl-3,4,4b, 5,6,9,10,10a-octahydro-2 H - phenanthrene carboxylic acid D -pimaric acid	(1 R , 4a R , 4b S , 7 R , 10a R ) -7-ethenyl-1,4a, 7-trimethyl-3,4,4b, 5,6,9,10,10a-octahydro-2 H - phenanthrene carboxylic acid Cryptopimaric acid Isodextropimaric acid	(1 R , 4a R , 4b S , 7 S , 10a R ) -7-ethenyl-1,4a, 7-trimethyl-3,4,4b, 5,6,8,10,10a-octahydro-2 H - phenanthrene carboxylic acid 4- epi -isopimaric acid (+) - isopimaric acid	(1 R , 4a R , 4b S , 10a R ) -1,4a-Dimethyl-7-propan-2-yl-2,3,4,4b, 5,9,10,10a-octahydrophenanthrene carboxylic acid L -pimaric acid β-pimaric acid
CAS number	127-27-5	471-74-9	5835-26-7	79-54-9
PubChem	220338	221580	442048	221062
Molecular formula	C 20 H 30 O 2
Molar mass	302.46 g mol −1
Physical state	firmly
Brief description	Solid
GHS labeling	no classification available	no classification available	no classification available	no classification available
H and P phrases	see above	see above	see above	see above
	see above	see above	see above	see above
	see above	see above	see above	see above

Occurrence

Rosin in pieces

The pimaric acids were found to be part of the rosin .

Individual evidence

1. ^ Entry on rosin. In: Römpp Online . Georg Thieme Verlag, accessed on May 20, 2016.