摘要:
This invention concerns processes for preparing .beta.-santalol, .beta.-santalene, dihydro-.beta.-santalol, tetrahydro-.beta.-santalol and related compounds from camphene. The invention further concerns novel compounds useful as intermediates in these processes and as fragrance adjuncts.
摘要:
Novel semisynthetic .beta.-lactam intermediates of use in the production of cephalosporins, penicillins and related .beta.-lactam antibiotic compounds are provided. The novel compounds are prepared from .beta.-lactams obtained by cleavage of the 1,2-sulphur-carbon bond of a penicillin 1-oxide (with subsequent internal or external trapping of the sulphur atom to leave a residual substituent as the .beta.-lactam nitrogen) by removal of the said residual substituent by an oxidative cleavage reaction.
摘要:
Electrophilic addition of fluorine to carbon-carbon multiple bonds which comprises reacting various unsaturated organic compounds in the liquid phase at low temperature with hypofluorites in which the fluoroxy group is covalently bonded to an inert electron-attracting group. A typical example of such a hypofluorite is trifluoromethyl hypofluorite. The reaction is generally applicable to a wide variety of aliphatic and aromatic organic compounds containing carbon-carbon multiple bonds.
摘要:
Preparation of a methyl ketone intermediate useful in the synthesis of (-)-dodecahydro-3a,6,6, 9a-tetramethyl-naphtho(2,1-b) furan by subjecting (-)-sclareol to ozonolysis in the presence of iodine or iodine-containing compound. The intermediate can be converted to (-)-dodecahydro-3a,6,6,9a-tetramethyl-naphtho(2,1-b) furan by Baeyer-Villiger oxidation followed by reduction of the resulting product in the presence of a Lewis acid.
摘要:
A novel nitromethylation composition comprising nitromethane and a catalytic amount of a bifunctional basic catalyst, optionally in an organic solvent, a method of nitromethylating ketonic compounds with said compositions and novel steroids of the formulae ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen, alkyl of 1 to 4 carbon atoms optionally substituted with an oxygen or nitrogen group or halogen and alkenyl and alkynyl of 2 to 4 carbon atoms, R.sub.2 is alkyl of 1 to 4 carbon atoms and the A,B,C and D rings optionally contain at least one double bond and optionally substituted with at least one member of the group consisting of --OH, .dbd.0, halogen, alkyl and alkoxy of 1 to 4 carbon atoms and alkenyl and alkynyl of 2 to 4 carbon atoms and their use to form the corresponding 21-acetoxy-20-ketocorticosteroids compounds in a simple manner.
摘要:
Polymeric optical filter agents and photographic products and processes using same are disclosed. The polymeric optical filter agents are pH-sensitive optical filter agents comprising polymeric backbone units having the following hydrazone moiety: ##STR1## where R is a group which can provide a double bond for conjugation with the ##STR2## portion of the moiety to provide light-absorbing capability for the agent at a pH above its pKa, and X represents a substituent of R providing at least one electron-withdrawing group. The polymeric pH-sensitive optical filter agents have a highly colored light-absorbing form at a pH above the pKa and are substantially non-absorbing at a pH below the pKa. The polymeric optical filter agents are useful in photographic film units and processes for the protection of photoexposed photosenstive elements against the occurence of fogging during in-light development.
摘要:
Derivatives of selenium as dehydrogenation agents employed in the presence of an oxidation agent consisting of oxidized derivatives of possibly substiuted iodoaromatic compounds, particularly where the derivatives of selenium are employed in catalytic amounts; as well as a process of dehydrogenation 3-oxygenated steroids into the corresponding 3-oxygenated .DELTA..sup.1,4 steroids.
摘要:
The present invention relates to the use of telluroxides as mild and selective oxidizing agents serving to oxidize certain functions, notably >C.dbd.S groups, in the presence of other relatively easily oxidized functions which remain unaffected; telluroxides of interest as oxidizing agents include, for example, compounds of the formula: ##STR1## wherein R and R.sup.1, which may be the same or different, each represent an optionally substituted aryl or heterocyclic group; or R and R.sup.1 together with the tellurium atom therebetween represent a heterocyclic ring, which may contain one or more further heteroatoms, and which may carry substituents and/or fused aromatic rings.
摘要翻译:本发明涉及在存在其它相对容易被氧化的功能而不受影响的情况下,用作氧化某些功能的特氟隆(特别是> C = S基)的氟氯化铁作为温和和选择性氧化剂的用途; 感兴趣的氧化铁作为氧化剂包括例如下式的化合物:其中R和R 1可以相同或不同,各自表示任选取代的芳基或杂环基; 或R和R 1与它们之间的碲原子表示杂环,其可以含有一个或多个另外的杂原子,并且其可以携带取代基和/或稠合芳环。
摘要:
Optical filter agents and photographic products and processes using same are disclosed. The optical filter agents are pH-sensitive hydrazone compounds conforming to the following structural formula: ##STR1## where R is any group which can provide a double bond for conjugation with the ##STR2## portion of the compound to provide light-absorbing capability or color for the agent at a pH above its pKa, X is a substituent of R providing at least one electron-withdrawing group and each R' can be defined as any substituent that does not impair the light-absorbing capacity of the compound at a pH above the pKa thereof. The pH-sensitive optical filter agents have a highly colored light-absorbing form at a pH above the pKa and are substantially non-absorbing at a pH below the pKa. The pH-sensitive optical filter agents are useful in photographic film units and processes for the protection of photoexposed photosensitive elements against the occurence of fogging during in-light development.