Determination of the Primary Hydroxyl Group Content of Polypropylene Glycols.

1962 ◽  
Vol 34 (9) ◽  
pp. 1147-1150 ◽  
Author(s):  
W. B. Crummett
Keyword(s):  
Hydroxyl Group ◽  
Group Content ◽  
Primary Hydroxyl

1-chlorobutadiene–butadiene rubber. III. Determination of hydroxyl group content

1979 ◽  
Vol 23 (7) ◽  
pp. 1951-1962 ◽  
Author(s):  
Shinzo Yamashita ◽  
Katsumi Sando ◽  
Shinzo Kohjiya
Keyword(s):  
Hydroxyl Group ◽  
Butadiene Rubber ◽  
Group Content

Determination of the hydroxyl-group content of epoxy resins

The Analyst ◽  
1970 ◽  
Vol 95 (1126) ◽  
pp. 80 ◽  
Author(s):  
E. J. Norton ◽  
L. Turner ◽  
D. G. Salmon
Keyword(s):  
Epoxy Resins ◽  
Hydroxyl Group ◽  
Group Content

scholarly journals Determination of arrangement of isoprene units in pig liver dolichol by 13C-n.m.r. spectroscopy

1987 ◽  
Vol 243 (2) ◽  
pp. 481-485 ◽  
Author(s):  
Y Tanaka ◽  
H Sato ◽  
A Kageyu ◽  
T Tomita
Keyword(s):  
Chemical Structure ◽  
Reversed Phase ◽  
Hydroxyl Group ◽  
Geometric Isomers ◽  
Model Compounds ◽  
Pig Liver ◽  
Isoprene Unit ◽  
Transfer Measurement ◽  
Slight Amount

The arrangement of isoprene units in pig liver dolichol-18, -19 and -20 was determined by 1H- and 13C-n.m.r. spectroscopies. The alignment of trans and cis isoprene units was found to be in the order: dimethylallyl unit, two trans units, a sequence of 14-16 cis units, and a saturated isoprene unit terminated with a hydroxyl group, which verified the presumed chemical structure of dolichol. The absence of geometric isomers was confirmed. A slight amount of impurity was detected in each reversed-phase h.p.l.c. fraction of dolichol obtained by a conventional method. Detailed assignments of the 13C-n.m.r. spectrum were given for these dolichols by using model compounds and INEPT (insensitive nuclei enhanced by polarization transfer) measurement. The chemical structure of synthetic dolichol-19, which was prepared by the addition of a saturated isoprene unit to the polyprenol-18 isolated from Ginkgo biloba, was confirmed to be identical with that of pig liver dolichol-19.

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