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norpinic acid
norpinic acid n.
Brit. 
/nɔːˌpɪnɪk ˈasɪd/
, /nɔːˌpɪnɪk ˈasɪd/U.S. /nɔrˌpɪnɪk ˈæsəd/
a crystalline dicarboxylic acid, C8H12O4, existing in cis and trans isomers and differing from pinic acid in having a carboxyl group attached to the cyclobutane ring in place of a carboxymethyl group./nɔrˌpɪnɪk ˈæsəd/ΘΚΠ
the world > matter > chemistry > organic chemistry > organic acids > [noun] > dicarboxylic acids > miscellaneous others
suberic acid1796
oxalovinic acid1838
citraconic acid1840
melanic acid1840
citramalic acid1864
citratartaric acid1864
isophthalic acid1870
methylmalonic acid1889
norpinic acid1909
naphthalic acid1920
1909 Jrnl. Chem. Soc. 95 1170 Our experiments have, however, shown that this ring, in norpinic acid, exhibits quite unusual stability.
1932 J. L. Simonsen Terpenes II. iii. 129 By the action of dilute hydrochloric acid at 180° [on the cis-isomer], an equilibrium mixture of cis- and trans-norpinic acids is obtained.
1960 A. R. Pinder Chem. of Terpenes v. 91 The molecular formula and properties of norpinic acid suggested it was derived from cyclobutane.
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