One-pot synthesis of hexahydro-4H-chromens via rhodium-catalysed tandem hydroformylation starting from 1,5-dienes
摘要:
A convenient one-pot preparation of substituted hexahydro-4H-chromens via rhodium catalysed tandem hydroformylation starting from 1,5-dienes is described. The multi-step procedure starts with a hydroformylation of one double bond followed by carbonyl ene reaction, a second hydroformylation and enol ether forming cyclisation. (C) 1999 Elsevier Science Ltd. All rights reserved.
Herbicidal sulfonamides, their preparation, compositions containing them and use thereof
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0010560A1
公开(公告)日:1980-05-14
Herbicidal sulfonamides, and the preparation and use thereof, the sulfonamides having the general formula
wherein
R, is
R2 and R3 are independently hydrogen, fluorine, chlorine, bromine, methyl, methoxy, nitro or trifluoromethyl;
W is oxygen or sulfur;
X is -NHCH3 or -N(CH3)2;
Z is methyl or methoxy; and
A is or N
or its agriculturally suitable salts provided that when R2 is nitro or trifluoromethyl, R3 cannot be nitro or trifluoromethyl.
The compounds can be formulated into compositions for agricultural use by conventional means. The compounds are useful for the regulation of plant growth and as herbicides, particularly for controlling volunteer corn in soybeans. They can be prepared by reacting an appropriate 2-aminoheterocycle with an appropriately substituted sulfonyl isocyanate or isothiocyanate.
杀草磺胺类化合物及其制备方法和用途,这些磺胺类化合物具有通式
其中
R,是
R2 和 R3 独立地为氢、氟、氯、溴、甲基、甲氧基、硝基或三氟甲基;
W 是氧或硫
X 是 -NHCH3 或 -N(CH3)2
Z 是甲基或甲氧基;以及
A 是或 N
或其农业上适用的盐,但当 R2 是硝基或三氟甲基时,R3 不能是硝基或三氟甲基。
这些化合物可通过常规方法配制成农用组合物。这些化合物可用于调节植物生长和用作除草剂,特别是用于控制大豆中的义玉米。这些化合物可通过适当的 2-氨基杂环与适当取代的磺酰异氰酸酯或异硫氰酸酯反应制备。
US4233226A
申请人:——
公开号:US4233226A
公开(公告)日:1980-11-11
US4231784A
申请人:——
公开号:US4231784A
公开(公告)日:1980-11-04
[EN] ODORANTS AND COMPOSITIONS COMPRISING ODORANTS<br/>[FR] ODORISANTS ET COMPOSITIONS COMPRENANT DES ODORISANTS
申请人:[en]S H KELKAR AND COMPANY LIMITED
公开号:WO2022024054A1
公开(公告)日:2022-02-03
The present invention relates to substituted hexahydro-5H-chromen-5-one and/or substituted tetrahydrobenzofuran-4(2H)-one derivatives which are useful as fragrance or flavor materials.