K C Kumara Swamy
Articles written in Journal of Chemical Sciences
Volume 108 Issue 3 June 1996 pp 298-298 Modern Trends In Inorganic Chemistry
Volume 108 Issue 3 June 1996 pp 299-299 Modern Trends In Inorganic Chemistry
Volume 111 Issue 3 June 1999 pp 489-500 Modern Trends In Inorganic Chemistry
Reaction of cyclic phosphites with 1,2-diketones and with diol/N-chlorodiisopropylamine has been studied. A large number of penta- and hexacoordinated phosphorus derivatives with varying ring sizes have been synthesized and structurally characterized. The reactivity of phosphites is compared with that of arsenites and pentacoordinated phosphoranes. Several phosphonates that are important as synthetic reagents have been prepared by reacting cyclic phosphites with aldehydes.
Volume 130 Issue 7 July 2018 Article ID 0099
Abstract. This perspective article is related to transformations (both catalytic and non-catalytic) involving allenes, alkynes/enynones/ynamides and isothiocyanates. Part of the work from the author’s group has been reviewed along with some new reactions of (i) allenylphosphonate/allenylphosphine oxide and (ii) a P(III) isothiocyanate. Thus, the allenylphosphine oxide Ph2P(O)C(Ph)=C=CH2 undergoes base (DBU) catalyzed addition to the β-ketophosphonate (OCH2CMe2CH2O)P(O)CH2C(O)CH3 at 90°C to afford the addition product Ph2P(O)C(Ph)=C(Me)CH[C(O)Me][P(O)(OCH2CMe2CH2O)]. In an analogous reaction, with DBU as the base at 140°C, isomeric vinylphosphine oxides (Z)-Ph2P(O)C(Ph)=C(Me)CH2[C(O)Me] and (E)-Ph2P(O)C(Ph)=C(Me)CH2[C(O)Me] were isolated. The E-isomer has been characterized by single crystal X-ray structure determination. In another set of studies, the reaction of P(III) isothiocyanate (OCH2CMe2CH2O)P(NCS) with N-(2-bromomethyl)sulfonamide afforded an unusual product with the formula(OCH2CMe2CH2O)P(O)SCH2CH2NHS(O)2-(C6H4-4-Me) as shown by X-ray structure determination. This result is different from that obtained in the recently reported analogous reaction using phenyl isothiocyanate.
Volume 133 All articles Published: 4 February 2021 Article ID 0006
AlCl3 acts as a chlorinating agent for ynamides in the presence of stoichiometric amount of water in the environmentally benign solvent dimethylcarbonate, affording efficient access to (E)-a-chloroenamides via hydrochlorination, with water as a protic source. The role of water in the reaction was proven by deuterium labelling experiment. Epoxy-ynamides undergo iodochlorination in addition to the cleavage of the epoxy ring to afford (E/Z)-a-chloro-b-iodo-enamides. Regio- and stereochemical assignments for the products are based on X-ray crystallographic studies.
Chloroenamides are formed regio- and stereo-specifically via hydrochlorination of ynamides with AlCl3+H2O (1:1) in a dimethyl carbonate; aryl substituted epoxy ynamides afford (iodo)(chloro) enamides upon treatment with ICl.
Volume 133, 2021
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