摘要:
The compounds of the invention are characterised by the formulae ##STR1## wherein index p represents an integer equal to 2 or 3 and q can take the value zero or 1, with the provision that p+q=3. Said compounds are obtained from hex-3-yne-2,5-diol following a process which comprises reacting an ethylenic compound of formula(CH.sub.3).sub.2 C.dbd.C(H).sub.n (CH.sub.3).sub.m (I)wherein index n represents an integer equal to 1 or 2 and m can take the values zero or 1 and wherein n+m=2, with hex-3-yne-2,5-diol, followed by the oxidation of the acetylenic ether obtained by means of ruthenium tetroxide. The compounds of formula (III) can be used as intermediate products for the preparation of 4-hydroxy-2,5-dimethyl-3(2H)-furanone (Furaneol.RTM.).
摘要:
The invention relates to a continuous process for the preparation of a flavor or fragrance delivery system, wherein the presence of two heat exchangers operating respectively an evaporation and cooling step, allow to optimize the quality and yield of the final product.
摘要:
1,1,2,3,4,4,6-Heptamethyl-1,2,3,4-tetrahydronaphthalene, a novel naphthalenic compound, is useful as an intermediate for the preparation of 5,6,7,8-tetrahydro-3,5,5,6,7,8,8-heptamethyl-2-naphthalenecarbaldehyde. It is prepared by a process consisting of the addition of an olefin of formula ##STR1## wherein R.sup.1 and R.sup.2 represent different substituents and each defines a hydrogen atom or a methyl radical, with p-cymene. 4,4-Dimethyl-2-pentene [compound (III): R.sup.1 =CH.sub.3 ; R.sup.2 =H] is obtained by the co-metathesis reaction of an olefin of formula ##STR2## wherein R.sup.1 and R.sup.2 represent identical substituents designating each a hydrogen atom or a methyl radical, with an olefin of formula ##STR3## wherein R.sup.3 and R.sup.4 identical or different, designate each a hydrogen atom or a methyl radical in the presence of an appropriate catalyst consisting of Re.sub.2 O.sub.7 on an inert solid carrier, or of WCl.sub.6 /(C.sub.2 H.sub.5))/Bu.sub.4 Sn.
摘要翻译:1,1,2,3,4,4,6-七甲基-1,2,3,4-四氢萘,一种新型的萘化合物,可用作制备5,6,7,8-四氢 - 3,5,5,6,7,8,8-七甲基-2-萘甲醛。 其通过加入式(III)的烯烃(其中R 1和R 2表示不同取代基并且各自定义氢原子或甲基)与对甲基异丙苯组成的方法制备。 4,4-二甲基-2-戊烯[化合物(III)):R1 = CH3; R2 = H]是通过将每个氢原子或甲基自由基的式Ⅸ取代基的烯烃与式Ⅵ的烯烃进行共同换位反应而获得的,每一个表示氢原子或甲基,在 在惰性固体载体或WCl 6 /(C 2 H 5))/ Bu 4 Sn上由Re 2 O 7组成的合适的催化剂。
摘要:
1,1,2,3,4,4,6-Heptamethyl-1,2,3,4-tetrahydronaphthalene, a novel naphthalenic compound, is useful as an intermediate for the preparation of 5,6,7,8-tetrahydro-3,5,5,6,7,8,8-heptamethyl-2-naphthalenecarbaldehyde. It is prepared by a process consisting in the addition of an olefin of formula ##STR1## wherein R.sup.1 and R.sup.2 represent different substituents and each defines a hydrogen atom or a methyl radical, with p-cymene. 4,4-Dimethyl-2-pentene [compound (III): R.sup.1 =CH.sub.3 ; R.sup.2 =H] is obtained by the co-metathesis reaction of an olefin of formula ##STR2## wherein R.sup.1 and R.sup.2 represent identical substituents designating each a hydrogen atom or a methyl radical, with an olefin of formula ##STR3## wherein R.sup.3 and R.sup.4, identical or different, designate each a hydrogen atom or a methyl radical in the presence of an appropriate catalyst consisting of Re.sub.2 O.sub.7 on an inert solid carrier, or of WCl.sub.6 /(C.sub.2 H.sub.5).sub.2 O/Bu.sub.4 Sn.
摘要翻译:PCT No.PCT / CH92 / 00128 Sec。 371日期1995年3月29日 102(e)1995年3月29日PCT PCT。1992年6月29日PCT公布。 出版物WO93 / 04023 日期1993年3月4日.1,1,2,3,4,4,6-七甲基-1,2,3,4-四氢萘(一种新型的萘化合物)可用作制备5,6,7 ,8-四氢-3,5,5,6,7,8,8-七甲基-2-萘甲醛。 它通过一种方法制备,该方法包括加入式取代基的烯烃,并且各自定义氢原子或甲基与对甲基异丙基苯。 4,4-二甲基-2-戊烯[化合物(III)):R1 = CH3; R2 = H]是通过式(I)的烯烃与式(Ⅰ)的烯烃(II)的共转换反应得到的,其中R 1和R 2表示与氢原子或甲基基团相同的取代基, )其中R 3和R 4相同或不同,在惰性固体载体或WCl 6 /(C 2 H 5)2 O / Bu 4 Sn上由Re 2 O 7组成的合适催化剂存在下,各自表示氢原子或甲基。