Showing papers on "Pyran published in 1969"

7 10 - dihydro - 3 - alkyl - 6h - dibenzo(b d) pyran-6 9(8h)-diones and 5-hydroxy-7-alkyl-4-chromanones

Abstract: 7,10-DIHYDRO - 3 - ALKYL-6H-DIBENZO(B,D)PYRAN-6,6(8H)DIONES WHICH ARE INTERMEDIATES FOR THE PHYSCHOTROPIC AND ANALGESIC 3-ALKYL - 9 - HYDROCARBYL(IDENE) - 6H - DIBENZO (B,D)PYRANS, 5-HYDROXY-7-ALKYL-4-CHROMANONES ARE ALTERNATE PATHWAY INTERMEDIATES IN THE PRODUCTION OF THE FINAL PRODUCT DIBENZO(B,D)PYRANS.

(Perfluoroacyl)thiophens. Part II. Fluorination of hexafluoro-1,3-di-(2-thenoyl)propane

Abstract: Improved yields of hexafluoro-1,3-di-(2-theonyl)propane are obtained by the reaction of perfluoroglutaric acid with a large excess of 2-thienylmagnesium bromide. The diketone has been successfully fluorinated with sulphur tetrafluoride to give decafluoro-1,5-di-(2-thienyl)pentane and a small quantity of material believed to be octafluoro-2,6-di-(2-thienyl)pyran. Mild nitratio of the former gives a mixture of isomeric dinitro-derivatives.

Photochemistry of 4-hydroxy-6-methyl-(2H)-pyran-2-one (triacetic acid lactone)

Abstract: The irradiation of triacetic acid lactone in various solvents results in novel rearrangement to β-methylglutaconic acid derivatives.

Process for making 7-chloro-7-deoxylincomycin and related compounds and novel intermediates produced therein

Abstract: COMPOUNDS OF THE FORMULA: 2-(R-S-),3,4,5-TRI(HO-),6-(CH3-CH(-CL)-CH(-NH-AC)-)- TETRAHYDROPYRAN ARE PREPARED BY REPLACING BY CHLORINE, THE 7-HYDROXY OF A COMPOUND OF THE FORMULA: 2-(R-S-),3,4,5-TRI(HO-),6-(CH3-CH(-OH)-CH(-NH-AC)-)- TETRAHYDROPYRAN THE REPLACEMENT IS EFFECTED BY (1) MIXING THE STARTING COMPOUND OF FORMULA II WITH THIONYL CHLORIDE, (2) HEATING WITH THIONYL CHLORIDE, AND (3) HYDROLYSIS. THIONYL CHLORIDE WITHOUT HEATING CONVERTS THE COMPOUNDS OF FORMULA II TO A 3,4-O-CYCLIC SULFITE OF THE FORMULA: HEATING WITH THIONYL CHLORIDE CONVERTS COMPOUNDS OF FORMULAS II AND III TO A 3,4-O-CYCLIC SULFITE OF THE FORMULA: PERHYDRO-1,3,2-DIOXATHIOLO(4,5-C)PYRAN 2-(O=),4-(CH3-CH(-OH)-CH(-NH-AC)-),6-(R-S-),7-(HO-)- SOLVOLYSIS CONVERTS COMPOUNDS OF FORMULAS IV AND V TO A 7-CHLORO-7DEOXYLINCOMYCIN OF FORMULA I. PERHYDRO-1,3,2-DIOXATHIOLO(4,5-C)PYRAN (2-(O=),4-(CH3-CH(-CL)-CH(-NH-AC)-),6-(R-S-),7-(HO-)- AND A BIS-SULFITE OF THE FORMULA: PERHYDRO-1,3,2-DIOXATHIOLO(4,5-C)PYRAN 2-(O=),4-(CH3-CH(-CL)-CH(-NH-AC)-),6-(R-S-),7-(HO-)-

Pyran-carboxylic acid anilides

Abstract: IN WHICH R STANDS FOR HYDROGEN, METHYL OR METHOXY IN THE META, ORTHO OR PAR-POSITION IN THE BENZENE NUCLEUS. THE NOVEL COMPOUNDS ARE USED AS FUNGICIDES. 2-(CH3-),3-((R-PHENYL)-NH-CO-)-5,6-DIHYDROPYRAN 2-METHYL-5,6-DIHYDROPYRAN-3-CARBOXYLIC ACID ANILIDES OF THE GENERAL FORMULA

Reaction of ethanesulfenyl chloride with 2-methoxy-5,6-dihydro-2H-pyran

Abstract: The reaction of ethanesulfenyl chloride with 2-methoxy-5,6-dihydro-2H-pyran gives only 4β-chloro-3α-ethylthio-2β-methoxytetrahydropyran. A rationale is presented to explain the observed highly selective reaction.

Process for the manufacture of Organic Isocyanates

Abstract: 1,152,877. Preparation of isocyanates. IMPERIAL CHEMICAL INDUSTRIES Ltd. 24 Nov., 1967 [1 Dec., 1966], No. 53798/66. Heading C2C. Organic isocyanates are prepared by contacting together in the presence of an acid acceptor, a solution of phosgene in an inert organic solvent and a solution or dispersion of an organic primary amine in water, separating the liquid non-aqueous phase and recovering the isocyanate therefrom. The reaction is preferably carried out with mechanical agitation. In examples, the acid acceptor is sodium or calcium hydroxide, the inert organic solvent is toluene, o-xylene, n-hexane, methylene dichloride or petroleum ether and hexamethylene diisocyanate, ethyl isocyanate, phenyl isocyanate, p-phenylene diisocyanate, butyl isocyanate, allyl isocyanate, 2 - isocyanatomethyl - 3,4- dihydro - 2H - pyran and 2 - isocyanatomethyl- 2,5 - dimethyl - 3,4 - dihydro - 2H - pyran are prepared.