Conformation-Specific Spectroscopy and Populations of Diastereomers of a Model Monolignol Derivative: Chiral Effects in a Triol Chain
作者:Jacob C. Dean、Evan G. Buchanan、William H. James、Anna Gutberlet、Bidyut Biswas、P. Veeraraghavan Ramachandran、Timothy S. Zwier
DOI:10.1021/jp204367k
日期:2011.8.4
HMPPT is a close analog of coniferyl alcohol, one of the three monomers that make up lignin, the aromatic biopolymer that gives structural integrity to plants. In HMPPT, the double bond of coniferyl alcohol has been oxidized to produce an alkyl triol chain with chiral centers at C(α) and C(β), thereby incorporating key aspects of the β-O-4 linkage between monomer subunits that occurs commonly in lignin
1-(4-羟基-3-甲氧基苯基)丙烷-1,2,3-三醇(HMPPT)的两个非对映异构体的单构象光谱已在孤立的喷射冷却条件下进行。HMPPT是松柏醇的紧密类似物,松柏醇是构成木质素的三种单体之一,木质素是赋予植物结构完整性的芳香族生物聚合物。在HMPPT中,松柏油基醇的双键已被氧化生成手性中心位于C(α)和C(β)的烷基三醇链,从而结合了通常发生的单体亚基之间的β-O-4键的关键方面在木质素中。(R,S)-和(R,R)-HMPPT非对映异构体已经以纯净的形式合成用于研究。进行了共振双光子电离(R2PI),UV孔燃烧(UVHB)/ IR-UV孔燃烧(IR-UV HB)和共振离子浸红外(RIDIR)光谱学,提供了单形态UV S 0 –S 1区域(35200–35800 cm –1)的光谱和氢化物拉伸区域的IR光谱。的(五个构象异构体[R ,小号) -和(四个构象异构体[R ,- [R)-HMPP