NOPR Collection:

A new method for dehydrogenation of symmetric hydrazo compound

1999-08-01T00:00:00Z

Title: A new method for dehydrogenation of symmetric hydrazo compound Authors: Wang, Cailan; Wang, Xiaoxia; Wang, Yulu Abstract: A new synthetic route with N-bromosuccinimide (NBS) and pyridine as oxidation system to dehydrogenate symmetric hydrazo compounds for preparing azo compounds is reported for the first time. Eight azo compounds are prepared in good yields under mild conditions and possible mechanism has been suggested. Page(s): 964-965

New pterocarpans from Oroxylum indicum stem bark

1999-08-01T00:00:00Z

Title: New pterocarpans from Oroxylum indicum stem bark Authors: Ali, Mohd; Chaudhary, Anurag; Ramachandram, Ramidi Abstract: From the stem bark of Oroxylum four new pterocarpans, namely methyl oroxylopterocarpan 1, undecanyl oroxylopterocarpan 2, hexyl oroxylopterocarpan 3, and heptyl oroxylopterocarpan 4, have been isolated and characterized as 2', 3'-dihydro-2',2'-dimethyl-2,3-furanylpterocarpan; 2',3'-dihydro-2'-methyl-2'-undecanyl-2,3-furanyl-8-hydroxypterocarpan; 2',3'dihydro-2'-methyl-2'-undercanyl-2,3-furanyl-8-hydroxypterocarpan and 2',3'- dihydro-2'- hexyl-2,3-furanyl-8- hydroxypterocarpan on the basis of spectral data and chemical analysis. Page(s): 950-952

Revised structures of the flavonoids from Limnophila gratissima (Scrophulariaceae)

1999-08-01T00:00:00Z

Title: Revised structures of the flavonoids from Limnophila gratissima (Scrophulariaceae) Authors: Krishnan, Sujatha; Nair, A G Ramachandran Abstract: 7-Desmethylartemetin (5,7-dihydroxy-3,6,3',4'-tetramethoxy-flavone), a rare flavonoid reported from Limnophila gratissima, has been found to be a mixture or two) flavones [5,7-dihydroxy- 6,8,4'-trimethoxyflavone (nevadensin) and 5-hydroxy-6,7.4'-trimethoxy flavone (salvigenin)]. Besides the plant contains two phenolic acids; caffeic acid and chlorogenic acid. The present finding is supported by chemotaxonomy of Scrophulariaceae. Page(s): 1009-1010

X-Ray crystallographic study of 1-methyl-4-( 4-N,N-dimethylamino) styryl pyridinium iodide

1999-08-01T00:00:00Z

Title: X-Ray crystallographic study of 1-methyl-4-( 4-N,N-dimethylamino) styryl pyridinium iodide Authors: Mishra, A; Behera, R K; Fronczek, F R; Vidyasagar, M; Behera, G B Abstract: Styryl pyridinium iodide dye (C₁₆H₁₉N₂I), is monoclinic P2₁/c, a= 6.3313(8)Å, b= 7699(2) Å, c=32.119(7) Å, β= 90.39(1)° ,V= 1565.6(9) Å³, Z= 4, D_c= 1.544gcm^-3, λ(MoK)= 0.7 1073 Å, μ= 20.12cm^-1 , F₀₀₀ = 728, T = 298 °K. 4707 unique reflections measured; final R=0.032 for 3959 retlections with I > 1.0σ(I). The three dimensional structure of the dye is presented. The structure analysis shows that the dye exist in trans form and is approximately planner. Page(s): 982-985