Organoboron Compounds. I. On the Reaction ofn-Butylboronic Acid with Polyvinylalcohol

Autor:	Shigenobu Kitajima, Yojiro Tsuzuki, Seiji Kato
Rok vydání:	1961
Předmět:	Organoboron compounds Reaction temperature Absorption band Chemistry N-butylboronic acid Polymer chemistry chemistry.chemical_element Infrared spectroscopy General Chemistry Absorption (chemistry) Boron
Zdroj:	Bulletin of the Chemical Society of Japan. 34:1107-1110
ISSN:	1348-0634 0009-2673
DOI:	10.1246/bcsj.34.1107
Popis:	It has been shown that PVA is partially esterified with n-butylboronic acid, giving products of the form of PVA (Remark: Graphics omitted.)B-n-Bu.The esterification grade, Eg, of the products is estimated from the boron content. Eg increases with the increasing concentration of n-butylboronic acid used, the maximum Eg being 85.6%. Eg rises from 69.3 to 85.6% as the reaction temperature is elevated from 40 to 70°C.On treating with n-butylboronic acid PVA shows new absorption bands 1190 and 1390 cm−1 in deeper infrared spectra, which are assigned respectively to –B–C and –B–O bonds. At the same time the OH stretching absorption band at 3280 cm−1 of PVA shifts to a higher frequency, and decreases in intensity with the increasing Eg.
Databáze:	OpenAIRE
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