全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:Gurdial Singh , Richard H Wightman
来源:[J].Beilstein Journal of Organic Chemistry(IF 2.801), 2008, Vol.4 (1), pp.43DOAJ
摘要:Treatment of 5-( tert -butyldimethylsilyl)-2,3- O -isopropylidene-D-ribose with lithium acetylides gave mixtures of syn - and anti -alkynols 2a– 2c which were separated following protection as methoxymethyl ethers. These were converted to the corresponding iodides which unde...
作者:Gurdial Singh , Patrice G.J. Plaza-Alexander ...
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2014, Vol.25 (20-21), pp.1424-1429Elsevier
摘要:Abstract(#br)The preparation and NMR analysis of 2,3-di- O -benzyl d -ribose and 2,3-di- O - d -xylose are described. In DMSO- d 6 the sugars adopt a conformation in which the hydroxyl groups are in an equatorial position. In CDCl 3 and CD 2 Cl 2 the sugars adopts a conformation ...
作者:John W. Nicholson , Gurdial Singh
来源:[J].Biomaterials(IF 7.604), 1996, Vol.17 (21), pp.2023-2030Elsevier
摘要:Abstract(#br)Organic compounds of phosphorus have been developed for a range of applications in clinical dentistry. These include dentine bonding agents, restorative materials and therapeutic agents, such as active ingredients in anticaries mouthwashes. A characteristic feature o...
作者:Gurdial Singh
来源:[J].Phosphorus, Sulfur, and Silicon and the Related Elements(IF 0.601), 1983, Vol.18 (1-3), pp.217-220Taylor & Francis
摘要:The syntheses of polyphosphinates 2 and 2a by the ring-opening polymerization of cyclic phosphonites 1 and 1a with CH3I as an initiator have been reported in literature1-3. These polymers thermally decompose to give oxaphospholan 3 and 3a. In this paper, we present evidence on th...
作者:Gurdial Singh
来源:[J].Phosphorus, Sulfur, and Silicon and the Related Elements(IF 0.601), 1987, Vol.30 (1-2), pp.279-282Taylor & Francis
摘要:31P, 13C, and 1H NMR data of (p-XC6H4)3P+R I- where R = Me, Me3CCH2 or Me3SiCH2 and X = H, Me, OMe or NMe2 are reported and discussed in terms of hyperconjugative pπ-dπ bonding involving the α C-H or C-Si bonds and the direct β atom (H or Si) with the 3d orbitals of phosphor...
作者:Gurdial Singh
来源:[J].Phosphorus, Sulfur, and Silicon and the Related Elements(IF 0.601), 1990, Vol.49 (1-4), pp.159-162Taylor & Francis
摘要:Thermolysis and reactions of methyltris(p-methoxyphenyl)phosphonium iodide with triphenylphosphine are reported. NMR and mass spectr evidence for the formation of phosphonium inner salts, →P6,H6 O--p, is presented.
作者:Gurdial Singh
来源:[J].Phosphorus, Sulfur, and Silicon and the Related Elements(IF 0.601), 1994, Vol.97 (1-4), pp.125-139Taylor & Francis
摘要:1H, 13C, and 31P NMR spectra of a series of alkyltriarylphosphonium salts, (p-XC6H4)3P+R I- (R = Me, CH2CMe3, and CH2SiMe3; X = H, Me, OMe, and NMe2) are reported. Their chemical shifts and coupling constants, 1JPC and 2JPH, are rationalized in terms of hyperconjugative π bo...
作者:Petar V. Kokotovic , Gurdial Singh
来源:[J].International Journal of Control(IF 1.008), 1971, Vol.14 (1), pp.51-64Taylor & Francis
摘要:A coupling perturbation method is developed for near optimum design of non-linear systems. A scalar parameter ε is introduced in an nth-order system such that for ε ε = the system decouples into two (or more) independent low-order sub-systems. By the same procedure ε is intr...
作者:Gurdial Singh , Hariprasad Vankayalapati
来源:[J].Tetrahedron: Asymmetry(IF 2.115), 2000, Vol.11 (1), pp.125-138Elsevier
摘要:Abstract(#br)Activation of the anomeric centre of 1- O -2,3,4,6-tetra- O -benzyl- d -mannopyranosyl propane-1,3-diyl phosphate in the presence of trimethylsilyl triflate allowed the preparation of α- or β-manno-linked glycosides.

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