三氟乙酸和其他布朗斯台德酸催化的10-烯丙基-2-氧代-Δ1 (9),3-六氢萘(12)的重排几乎只产生了[3 s,3 s ]产物1-和3- 5,6,7,8-四氢-2-萘烯丙基(分别为16和15)。用三氟乙酸酐或乙酸酐/硫酸对12进行重排,除15和16外,还会产生可观数量的[1 s,2 s ]重排产物4-烯丙基5,6,7,8-四氢- 2-萘酚(14)(表1)。
The microwave-accelerated Claisen rearrangement of allyl aryl ethers was investigated, in order to gain insight into the scope of the catalysts, solvents, temperatures, and substrates. Among the catalysts examined, phosphomolybdic acid (PMA) was found to greatly accelerate the reaction in NMP, at temperatures ranging from 220 to 300 °C. This method was found to be useful for preparing several intermediates
Bad odors on textile materials are often caused by body odor. The invention relates to a textile material treatment method for inhibiting body odor on textile materials, by which means the treated textiles, after having been worn, even after sweat-inducing sports activities, have a significantly reduced bad odor or even no odor. The invention also relates to a perfume composition and to a textile material treatment agent, respectively comprising urea derivatives and/or phenacylthiazolium salts, that counteract the formation of body odor.
Microwave assisted rapid and economical process for the preparation of substituted phenylaldehydes from trans and cis-phenylpropenes: a commercial utilisation of toxic cis-isomer
申请人:——
公开号:US20020153240A1
公开(公告)日:2002-10-24
The present invention provides microwave assisted rapid and economical process for the preparation of substituted phenylaldehydes from trans and cis-phenylpropene, a commercial utilization of toxic cis-isomer of the general formula (I)
1
using meta-periodate and osmium tetraoxide (catalytic amount) as an efficient oxidizing agent in the presence of catalyst namely amberlite IRA-410 and quaternary ammonium salt.
The present invention pertains to pro-fragrances and relates to a pro-fragrance compound of the formula (I). Furthermore, the invention relates to compositions, a laundry product, a home care product, and an insect repellant, comprising the compound of formula (I). Also encompassed are a method for preparing the compound of formula (I) and uses of a compound of formula (I) for increasing the longlastingness of a fragrance, for increasing the stability and perception of a fragrance, and for improving the adhesion of a fragrance to textiles.
The present invention relates to the use of at least one flavonoid for odour improvement and/or odour stabilisation, and to corresponding compositions and the preparation thereof.