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Three New Urea Derivatives from Pliocene‐Fossil Pinus armandii
Author(s) -
Zhao YouXing,
Li ChengSen,
Luo XiaoDong,
Yi TieMei,
Zhou Jun
Publication year - 2005
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200590015
Subject(s) - chemistry , urea , carbamic acid , organic chemistry , stereochemistry
Three new urea derivatives, isolated from the Pliocene lignified wood of Pinus armandii , were identified as carbonylbis[imino(6‐methyl‐3,1‐phenylene)]bis[carbamic acid] dimethyl ester ( 1 ), and as the corresponding dibutyl ester 2 and bis(2‐methylpropyl) ester 3 . Their structures were elucidated by spectroscopic methods, including MS and 1D‐ and 2D‐NMR techniques.