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C. J. Thomas

Bio: C. J. Thomas is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Phosphorus & Phosphine. The author has an hindex of 3, co-authored 5 publications receiving 24 citations.
Topics: Phosphorus, Phosphine, Triazene, Norbornadiene, Sulfur

Papers
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Journal ArticleDOI
TL;DR: In this paper, room temperature reactions of S4N4 with diphenylphosphines, (R)Ph2P, have yielded two different types of SN heterocycles under two different stoichiometric conditions.
Abstract: Room temperature reactions of S4N4 with (amino) diphenylphosphines, (R)Ph2P, have basically yielded two different types of SN heterocycles under two different stoichiometric conditions. Phosphiniminocyclotrithiatriazenes, (R)Ph2PNS3N3 (R = C4H8N, C5H10N, C6H12N, CH3NC4H8N, (C6H11)2 N, and (C6H5CH2)2N) have been obtained (yield 45–76%) from a 1:2 mole ratio (S4N4:(R)Ph2P) reaction, while the disubstituted S4N4 derivatives, 1,5-[Ph2(R)PN]2S4N4 (R = C4N8N, C5H10N, and C6H12N) have been obtained (yield 30–45%) only from a 1:3.5–4 mole ratio reaction. All the 1,5-[Ph2(R)PN]2S4N4 derivatives prepared in this study undergo a room temperature solution phase transformation to the corresponding (R)Ph2PNS3N3 heterocycles.

12 citations

Journal ArticleDOI
TL;DR: In this article, the cyclophosphathiazenes Ph2PS2N3(2) and 1,5(Ph2P)2S2N4 (3) are isolated from the same reaction mixture under reflux conditions.
Abstract: Tetrasulfurtetranitride, S4N4 reacts with (2-pyridylamino)-diphenylphosphine in MeCN at room temperature to form the cyclotrithiazene (NC5H4NH)-Ph2PN-S3N3 (1) in good yield. By contrast, the cyclophosphathiazenes Ph2PS2N3(2) and 1,5(Ph2P)2S2N4 (3) are isolated from the same reaction mixture under reflux conditions. In solution, compound 1 is found to be transformed into 2. The reaction of S4N4 with (2-pyridylamino)phenyl(dicyclohexylamino)phosphine in MeCN at room temperature affords Ph(DCA)PS2N3 (4) (DCA = dicylohexylamino) as the only reaction product. This on treatment with norbornadiene produces the addition product Ph(DCA)PS2N3.C7H8 (5). The structure of 4 has been established by X-ray diffraction. Its PSN ring adopts a skew boat conformation with S-N bond lengths varying from 1.574(4) to 1.606(4) angstrom. The mean value of the endocyclic P-N bonds amounts to 1.618(3) angstrom.

8 citations

Journal ArticleDOI
TL;DR: In this article, the reaction of S4N4 with dicyclohexylaminophenyl-(2-aminopyridyl)phosphine in MeCN at room temperature leads to the formation of the novel compound Ph(cycloHex2 N)PS2 N3.
Abstract: The reaction of S4N4 with dicyclohexylaminophenyl-(2-aminopyridyl)phosphine in MeCN at room temperature leads to the formation of the novel compound Ph(cycloHex2 N)PS2 N3. An X-Ray structure determination confirms that this, compound consists of a six-membered PSN-ring with two different substituents at phosphorus.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: The chemistry of simple acyclic aminophosphines (synthesis, characterization, reactivity and applications) is covered and particular focus is given to their ability to form chalcogenides along with their role played as ligands in coordination chemistry and as synthons in inorganic heterocyclic chemistry as mentioned in this paper.
Abstract: In recent years, research in organophosphorus chemistry has mainly focused in designing newer and better phosphorus ligands for synthesizing novel metal complexes with improved catalytic activities. Aminophosphines [tricoordinate phosphorus(III)–nitrogen systems] are considered as versatile compounds owing to the presence of nitrogen centres which, in principle, can influence additional reactivity features. They are quite sensitive to air and moisture due to the presence of polar PN bond(s). In spite of this, research in aminophosphine chemistry is gaining momentum day-by-day and this is due mainly to one reason: their rich behaviour as ligands in metal complex chemistry and subsequently in catalysis. Their role as synthons in inorganic heterocyclic chemistry has also helped produce new types of heterocycles. In this paper, the chemistry of simple acyclic aminophosphines (synthesis, characterization, reactivity and applications) is covered and particular focus is given to their ability to form chalcogenides along with their role played as ligands in coordination chemistry and as synthons in inorganic heterocyclic chemistry. Copyright © 2009 John Wiley & Sons, Ltd.

79 citations

Journal ArticleDOI
TL;DR: A series of organotin (IV) compounds of the type [R3SnL]2, R is Me (1), Bu (2), [R2SnL], R is Ph (3), Me (4), Bu(5), L is pyruvic acid thiophene-2-carboxylic hydrazone, and R2snL as mentioned in this paper have been synthesized in 1:1 molar ratio.

75 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis, derivatization and coordination behavior of N-diphenylphosphinomorpholine (1) and N-diaphinopiperazine (2) is described.

20 citations

Journal ArticleDOI
TL;DR: In this article, room temperature reactions of asymmetric phosphines, (Ph)(DCA)(R)P (R  Et2N, I; Bu2nN, II) with S4N4 in acetonitrile afforded phosphiniminocyclotrithiazenes.

14 citations

Journal ArticleDOI
TL;DR: The reaction of S4N4 with phosphines of the type PhPR2 (1,5) and PhR′PR [6−11 (R′ = dicyclohexylamino), R: 1,6 = pyrrolidino, 2,7 = piperidino; 3,8 = morpholino; 4,9 = N-methylpiperazino; 5,10 = hexamethylenimino; and 11 = anilino] afford the phosphiniminocyclotrithiazene
Abstract: The reactions of S4N4 with phosphines of the type PhPR2 (1–5) and PhR′PR [6–11 (R′ = dicyclohexylamino), R: 1,6 = pyrrolidino; 2,7 = piperidino; 3,8 = morpholino; 4,9 = N-methylpiperazino; 5,10 = hexamethylenimino; and 11 = anilino] afford the phosphiniminocyclotrithiazene derivatives, 12–22 at room temperature. Only in the case of the phosphine 10 was the disubstituted derivative 23 isolated (in 65% yield). The trithiazene derivatives of the chiral phosphines in refluxing CH3CN produce the acyclic compounds PN–S3N, 24–27 in ca. 60% yield. Norbornadiene reacts at room temperature with the cyclotrithiazene derivatives to give the addition products 28–35. P=N–S3N3 derivatives are found to be stable in 2M NaOH. © 1997 John Wiley & Sons, Inc. Heteroatom Chem 8: 225–232, 1997.

10 citations