A5016575071- Inorganic and Organometallic Chemistry
- Asymmetric Synthesis and Catalysis
- Oxidative Organic Chemistry Reactions
- Organic Chemistry Cycloaddition Reactions
- Radical Photochemical Reactions
- Fluorine in Organic Chemistry
- Synthetic Organic Chemistry Methods
- Geotechnical Engineering and Soil Stabilization
- Catalytic C–H Functionalization Methods
- Eicosanoids and Hypertension Pharmacology
- Chemical Synthesis and Reactions
- Free Radicals and Antioxidants
- Analytical Chemistry and Chromatography
- Chemical Synthesis and Analysis
- Geotechnical Engineering and Analysis
- Geotechnical Engineering and Underground Structures
- Porphyrin and Phthalocyanine Chemistry
- Vanadium and Halogenation Chemistry
- Molecular spectroscopy and chirality
- Asymmetric Hydrogenation and Catalysis
- Chemical Reaction Mechanisms
- History and advancements in chemistry
- Cancer Treatment and Pharmacology
- Synthesis of heterocyclic compounds
- Cyclopropane Reaction Mechanisms
Indian Institute of Technology Jodhpur
2021-2022
Birla Institute of Technology and Science, Pilani
2016-2020
University of Nottingham
1982-1996
University of Delhi
1990
G. B. Gill, Q. Rev. Chem. Soc., 1968, 22, 338 DOI: 10.1039/QR9682200338
Treatment of appropriately substituted Se-phenyl 5,9,13-triene- and 5,9,13,17-tetraene-selenoates, i.e 9b,33,40,47a 47b, with Bu3SnH–AIBN is found to lead angular six-ring fused polycycles, viz. 20, 34, 50, 53 54 respectively, via consecutive 6-endo-trig modes cyclisations, starting from the corresponding polyene acyl radical intermediates. The structures stereochemistries polycyclic products were determined largely detailed analysis correlation 13C NMR spectroscopic data. trans-anti-trans...
Carbamoylcobalt(III) salophen compounds, such as 4, are sources of carbamoyl radicals under either thermal or photolytic conditions. Generation N,N-dimethylcarbamoyl radicals, e.g.5, in the presence trapping agents diphenyl disulfide 2,2,6,6-tetramethylpiperidin-1-yloxy radical 7 afforded expected amido derivatives, e.g.6 and 8, respectively. These 5 also underwent oxidative intermolecular addition to styrene; process gave E-cinnamide 10 exclusively, whereas photochemical conditions a 1:1...
A series of maleimides 5 have been prepared by reaction the appropriate maleic anhydrides with either ammonium acetate or methylammonium in boiling acetic acid. The underwent Wittig-type reactions stabilised phosphoranes, under moderately forcing conditions, to give 5-ylidenepyrrol-2(5H)-ones 6. ease and regiochemistry addition unsymmetrical depended upon nature 3-substituent on presence absence an N-alkyl substituent. Thus, 3- methoxymaleim ides reacted exclusively at C-2; N-methyl...
Two-step reaction sequences to 4-substituted tricyclo[4,3,1,03,8]decanes and 3-substituted tricyclo[3,3,1,03,7]nonanes are reported: the key step in each case involves scission of a t-adamantyloxy-radical.
Indane-1,2,3-trione 1 is conveniently prepared in quantitative yield by the azeotropic drying of ninhydrin 2 using chlorobenzene as solvent. The central CO group trione extremely electrophilic and ene addition occurs at this site with a wide range alkenes terminal alkynes aprotic solvents moderate temperatures (70–130 °C). reactivity somewhat attenuated solvent, additions are consistently faster chloroform than tetrahydrofuran. Stereoselectivity, when relevant, appears largely to be dictated...
G. B. Gill, N. Gourlay, A. W. Johnson and M. Mahendran, J. Chem. Soc. D, 1969, 631 DOI: 10.1039/C29690000631
G. B. Gill and H. Williams, J. Chem. Soc., 1965, 995 DOI: 10.1039/JR9650000995
G. B. Gill and H. Williams, J. Chem. Soc., 1965, 7127 DOI: 10.1039/JR9650007127
A range of substituted Se-phenyl 5,9-dieneselenoates, viz. 15a, 25, 26, 27, 42 and 52, have been synthesised their reactions with Bu3SnH–AIBN investigated. The diene esters 52 are shown to lead decalone perhydrophenanthrone derivatives, 19, 43 53, respectively, via consecutive 6-endo trig modes cyclisations starting from the corresponding 5,9-diene acyl radical intermediates. By contrast, 5,9-dienoates 25 27 lacking alkyl substitution at C-9 instead underwent cyclisation indanones 36 37,...
S. F. A. Kettle, P. B. D. de la Mare, J. Lomas, H. Pacini, E. Pavlath, L. Cotter, Gore, Hoskins, Wladislaw, Giora, Miller, R. Prince, I. M. Keen, G. Tuck, Faithful, Haslam, Marriott, Gill, Williams, C. Barker, Hallas, N. Thornber, Crombie, Shaw, W. Bird, Colvin, Parker, K. Fields, Leslie, Hamer, Downie, Morris, Hiscock, Whitehurst, Green, Tipping, T. van Es, Staskun, Trahanovsky, Young, Bristow, Khowaja, Tillett, Fischer, Hutchinson, Topsom, Carruthers, Watkins, Knight, Roberts and...
Under this study, model footing tests were conducted on sand reinforced with waste tire chips. Effect of Tire-chip content, depth reinforcement and relative density Reinforced Sand (TRS) was studied. There is significant improvement in pressure settlement behaviour TRS at low strains as well high strains. It found that optimum tire-chip content 20% by weight (2–5% ratios) 40% (10–20% ratios). Pressure better than geogrid-reinforced up to 10% ratio. Therefore, use tyres beneficial from both...
The addition of chloral and bromal to a variety alkyl-substituted alkenes has been investigated. effect on the reaction varying Lewis acid catalyst structure substrate have studied. Anhydrous AlCl3 was found be most effective catalyst, ene-type adducts were major products in cases. Side reactions observed with less reactive systems leading, variously, formation trihalogenoketones, hydrohalpgenated ene adducts, cyclic ethers. Conditions for optimising yield established some trihalogenoketone...
Cobalt(I)-mediated mono- and bi-cyclisations of halo-polyenes are compared contrasted with corresponding reactions using the Heck reaction. The procedures found to complement one another, each having advantages disadvantages, in cases studied. Thus, treatment vinyl iodide 1 under conditions led novel 1,3-diene 3 93% yield, whereas reaction between cobalt(I) salophen resulted formation organocobalt complex 4 (∼50%) as black crystals. Subsequent irradiation then 6,5-ring fused bicycle 5 85%...
The thermal ene addition of chloral to (–)-β-pinene affords a 17 : 83 mixture the two diastereoisomers (1) and (2), ratio which is altered appreciably if Lewis acid employed enhance rate addition; with ferric chloride 97 3 (2) indicates that reaction has become almost completely stereoselective, results can be rationalised by simple steric model.
The Lewis acid catalysed ene additions of chloral and bromal to alkenes are completely regiospecific, moderately regioselective, often highly stereoselective. Diastereoselectivity in the addition (–)-β-pinene was a function acid, with TiCl4 essentially quantitative asymmetric induction observed. stereochemical phenomena explained satisfactorily by assuming active enophiles possess transoid structures such as (1), that concerted or rapid stepwise mechanism operates, product formation occurs...