5-phenyl-2,3-dihydro

The choice of the base and the solvent is crucial for the yield of a-sulfinyl carbanion alkylation. A high diastereoselection (80%) was observed in the alkylation of an a-sulfinyl carbanion with a-bromoacrylate56. In this ease the choice of the base appears to be decisive the highest asymmetric induction is found when the metalation is carried out using highly hindered bases, e.g., lithium tetramethylpiperidide. An interesting asymmetric synthesis of chiral 5-alkyl(or phenyl)dihydro-3-methylene-2(3f/)-furanoncs is based on this reaction56. 

CigHuBrNaOS l-[4<Brom>phenyl]-dihydro< [thiopyrano-4. 3 3.4-p rra2olon-(5)]... 

Rhodacyanines possess two chromophoric systems. They are at the same time neutrocyanine derivatives, which involves position 5 of the ketomethylene, and methine cyanine, which involves position 2. Following lUPAC s standard nomenclature rules, structure 7 is named 3-ethyl-4-phenyl-2- 4-oxo-3-ethyl-5-[2-(3-ethy]-2,3-dihydro-benzo-l,3-thiazo-lylidene)ethylidene]-tetrahydro-l,3-thiazolylidene-methyl -1.3-thiazolium iodide (Scheme 5). It implies that the 4-phenyl thiazole ring having the... 

Diethylamino)phenyl]-4,5-dihydro-l-phenyl-lH-pyra2ol-3 -yl]ethenyl]-N,N-diethylben2enamine, (5-(p-diethyl aminophenyl)-l-phenyl-3-(p-diethylamino-styryl)pyra2oline) [57609-72-0]... 

Phenyl-3,6-dihydro-l,3,4-oxadiazin-2-one (50) is a high temperature blowing agent used primarily for polycarbonates (qv). It is prepared by the reaction of a-hydroxyacetophenone and methyl carbazate (52), made from hydrazine and dimethyl carbonate (175) ... 

Some 4,5-disubstituted pyridazines exhibit ring-chain isomerism involving heterospiro compounds. For example, 5-(o-aminophenylcarbamoyl)pyridazine-4-carboxylic acid exists in a zwitterionic form in the solid state, but in a solution of DMSO it is almost exclusively 3, 4 -dihydro-3 -oxospiro[pyridazine-5(2//),2 (l //)-quinoxaline]-4-carboxylic acid (134). The equilibrium is strongly influenced by the nature of the solvent, the substituents on the pyridazine ring and the nucleophilicity of the group attached to the phenyl ring (Scheme 48) <80JCS(P2)1339). 

Of the classical Hofmann, Curtius, Lossen and Schmidt degradations, only a rare example of the first is known, hypobromite converting 4,7-diamino-2-phenyl-6-pteridinecar-boxamide (208) into 8-amino-2,3-dihydro-6-phenyl-l//-imidazo[4,5-g]pteridin-2-one (209 equation 64) (63JOC1203). 

Benzo[c]furan, 6-amino-1,3-dihydro-1 -phenyl- H NMR, 4, 574 <75JA5160>... 

Benzo[c]furan, 1,3-dihydro-1 -phenyl- H NMR, 4, 574 <75JA5160> Benzo[b]furan-2-carbaldehyde, 3,6-dimethoxy-UV, 4, 589 <71AJC1883> Benzo[b]furan-2-carbaldehyde, 3-methoxy-UV, 4, 589 <73AJC1079>... 

Isoxazolo[5,4-d]pyrimidine-4,6(5//,7//)-dione, la,3a-dihydro-5,7-dimethyl-3-phenyl- H NMR, 6, 619 <72JOC2983) Isoxazolo[5,4-d]pyrimidine-4,6(5//,7W)-dione, la,3a-dihydro-3-phenyl- H NMR, 6, 619 <72JOC2983)... 

Oxazolo[4,5-6]pyridin-2(3 H)-one IR, 6, 653 <76HCA1593) Oxazolo[4,5-fi]pyridin-2(3H)-one, 3-(4-chlorophenyl)-3a,7a-dihydro-6-methyl-X-ray, 6, 647 <79CPB2261) Oxazolo[4,5-6]pyridin-2(3H)-one, 3-(4-chlorophenyl)-3a,7a-dihydro-7a-methyl-X-ray, 6, 647 <79CPB2261) 5H-Oxazolo[3,2-a]pyridin-3(2H)-one, 2-phenyl-6,7,8,8a-tetrahydro-X-ray, 6, 646 <77MI42902) Oxazolo[5,4-d]pyrimidin-4-amine, A7-methyl- H NMR, 6, 650 <70BCJ3909)... 

UV, 6, 680 (71JCS(C)1527) 7H-Thiazolo[3,2-a]pyrimidin-7-one, 5-methyl-IR, 6, 681 (71JCS(C)2094) Thiazolo[3,2-c]pyrimidin-7-one, 2,3-dihydro-5-phenyl-... 

H-Azepine, 2,6,7-tri(methoxycarbonyl)-ring inversion, 7, 499 Azepine-1-carboxylic acid tricarbonylruthenium complexes, 7, 523 1 H-Azepine-2,3-dicarboxylic acid, 4,7-dihydro-6-phenyl-diethyl ester synthesis, 7, 539-540 1 H-Azepine-3,6-dicarboxylic acid... 

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