即使在存在芳族部分的情况下,醇和苯酚也可以被硝酸亚硫酰氯或硝酸亚硫酰有效地硝化。硝酸亚硫酰氯适用于碳水化合物中伯羟基的硝化,而硝酸亚硫酰具有足够的反应性,可以与仲羟基反应。这些试剂允许核糖核苷的5'-,2'5'-和3',5'-OH-基团的高选择性硝化,以高产率产生单保护或双保护的硝基衍生物。碳酸和某些酮的烯醇形式可以用三氟甲磺酰硝酸盐/叔丁醇钾有效地硝化。Lutidine N -oxide(2,6-(CH 3)2 C 5 H 3发现NO)对硝化反应具有显着影响。类似地,亚硫酰氯亚硝酸盐和亚硫酰亚硝酸盐显示出优异的上述底物的亚硝化能力。
Neat cinnamyl fluoride, geranyl fluoride, 5-carbomethoxy-3-fluorocyclohexene and parent 3-fluorocyclohexene undergo spontaneous decomposition on contact with borosilicate glass or catalytic quantities of moderately strong acids that consists in polycondensation with elimination of HF initiated by electrophilic abstraction of F−. Acid sensitivity of these allylicfluorides correlates with stability
CIS-3-HEXENAL CIS-3-HEXENYL ACETAL COMPOUND, PROCESS FOR PRODUCING THE SAME, AND FLAVOR/TASTE IMPARTING AGENT, FLAVOR/TASTE RETAINING AGENT AND PERFUME COMPOSITION EACH CONTAINING THE SAME
申请人:NIPPON ZEON CO., LTD.
公开号:EP0738700A1
公开(公告)日:1996-10-23
A compound represented by formula (1):
wherein R is alkyl or other hydrocarbyl, and a fragrance/flavor-imparting agent, a fragrance/flavor-retaining agent, and a perfume composition, each containing this compound as an active ingredient; and a process for preparing this compound either by reacting a compound of formula (2):
wherein R1 and R2 are hydrocarbyl, with cis-3-hexen-1-ol, or by reacting cis-3-hexenal-di-cis-3-hexenyl acetal with an alcohol, R1OH.