ChemInform Abstract: OCTAHEDRAL METAL CARBONYLS. 57. SUBSTITUENT, RING-SIZE AND METAL ATOM EFFECTS S ON CHELATE RING-CLOSURE IN (η1-BIDENTATE)M(CO)4) INTERMEDIATES (M = CR, MO, W)

1985 ◽  
Vol 16 (40) ◽  
Author(s):  
G. R. DOBSON ◽  
C. B. DOBSON ◽  
S. E. MANSOUR
Keyword(s):  
Metal Atom ◽  
Chelate Ring ◽  
Ring Closure ◽  
Ring Size ◽  
Metal Carbonyls

Octahedral metal carbonyls. 77. Kinetics of chelate ring closure via olefin-tungsten bond formation in chlorobenzene solvates of tungsten carbonyl intermediates

1992 ◽  
Vol 31 (16) ◽  
pp. 3482-3488 ◽  
Author(s):  
Shulin Zhang ◽  
I Hsiung Wang ◽  
Paul H. Wermer ◽  
Charles B. Dobson ◽  
Gerard R. Dobson
Keyword(s):  
Chelate Ring ◽  
Bond Formation ◽  
Ring Closure ◽  
Metal Carbonyls ◽  
Tungsten Carbonyl ◽  
Kinetics Of

Octahedral metal carbonyls. 54. Rates of chelate ring closure in five-coordinate metal carbonyl intermediates

1983 ◽  
Vol 105 (16) ◽  
pp. 5505-5506 ◽  
Author(s):  
Gerard R. Dobson ◽  
Saber E. Mansour ◽  
D. Eric Halverson ◽  
Erika S. Erikson
Keyword(s):  
Chelate Ring ◽  
Metal Carbonyl ◽  
Ring Closure ◽  
Metal Carbonyls

Di- and trimethylplatinum(IV) complexes with aspartate: some subtle effects of chelate ring size

Polyhedron ◽  
1995 ◽  
Vol 14 (19) ◽  
pp. 2613-2622 ◽  
Author(s):  
Trevor G. Appleton ◽  
John R. Hall ◽  
Trevor G. Jones ◽  
Jacqueline A. Sinkinson
Keyword(s):  
Chelate Ring ◽  
Ring Size ◽  
Chelate Ring Size

The Structure and Synthesis of Cytokinin Metabolites. 1. The 7- and 9-β-D-Glucofuranosides and Pyranosides of Zeatin and 6-Benzylaminopurine

1978 ◽  
Vol 31 (5) ◽  
pp. 1095 ◽  
Author(s):  
DE Cowley ◽  
CC Duke ◽  
AJ Liepa ◽  
JK Macleod ◽  
DS Letham
Keyword(s):  
Pyrimidine Ring ◽  
Ring Closure ◽  
Imidazole Derivative ◽  
High Yield ◽  
Ring Size ◽  
Plant Metabolites ◽  
One Pot ◽  
Synthetic Routes

The structures of the major stable plant metabolites of the cytokinins zeatin and 6-benzylaminopurine have been confirmed by synthesis to be 7- and 9-β-D-glucopyranosides. The small quantities of metabolites initially isolated (< 100 μg) precluded assignment of the glucose ring size or configuration of the anomeric linkage so that synthesis of both the furanose and pyranose forms of 7-β-D- and 9-β-D-glucosylzeatin and 6-benzylaminopurine was undertaken which allowed direct u.v., m.s. and t.l.c. comparison with the metabolites. Numerous synthetic routes to the unusual 7-glucosides of the two cytokinins were explored, the most successful utilizing a one-pot pyrimidine ring closure of an imidazole derivative to afford directly in high yield the required 7-glucosides of zeatin and 6-benzylaminopurine.

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