Sulfinylamine

Sulfinylamines (formerly N-sulfinyl amines) are organosulfur compounds with the formula RNSO where R = an organic substituent. These compounds are, formally speaking, derivatives of HN=S=O, i.e. analogues of sulfur dioxide and of sulfur diimide. A common example is N-sulfinylaniline. Sulfinyl amines are dienophile.[1] They undergo [2+2] cycloaddition to ketenes.[2]

N-Sulfinylaniline is a common sulfinylamine.

According to X-ray crystallography, sulfinylamines have planar C-N=S=O cores with syn geometry.[3]

line drawing of general structure of an N-sulfinyl amine

Preparation

Sulfinylamines can be made when thionyl chloride SOCl2 reacts with a primary amine.[4]

Reactions

Mixtures of phosphine and borane derivatives can attach to the NSO chain to yield a R'3P=N+(R)SOB−R"3 compound. This can happen with tris(tert-butyl) phosphine and tris-(pentafluorophenyl)borane.[4]

Compounds
formula name CAS No PubChem CID Chemspider ID MW ref
HNSO Thionylimide
Sulfinylamine
Sulfoximine		 13817-04-4 139610 123125 63.074 [5]
C6H5NSO N-Sulfinylaniline
N-Thionylaniline		 1122-83-4 70739 63904 139.172 [6]
N-sulfinyl-2,6-diethyl benzenamine [6]
N-sulfinyl-2-aminopyrimidine 110526-12-0 14790782 141.148
N-sulfinyl-n-butylamine [7]
N-sulfinyl-n-pentylamine [7]

References
  1. Kresze, G.; Wucherpfennig, W., "Organic synthesis with imides of sulfur dioxide", Angew. Chem. Int. Ed. Engl. 1967, volume 6, 149–167. doi:10.1002/anie.196701491
  2. Heravi, Majid M.; Talaei, Bahareh (2014). Ketenes as Privileged Synthons in the Syntheses of Heterocyclic Compounds. Part 1. Advances in Heterocyclic Chemistry. Vol. 113. pp. 143–244. doi:10.1016/B978-0-12-800170-7.00004-3. ISBN 9780128001707.
  3. Romano, R.M.; Della Védova, C.O. (2000). "N-Sulfinylimine compounds, R–N=S=O: A chemistry family with strong temperament". Journal of Molecular Structure. 522 (1–3): 1–26. Bibcode:2000JMoSt.522....1R. doi:10.1016/S0022-2860(99)00453-6..
  4. Longobardi, Lauren E.; Wolter, Vanessa; Stephan, Douglas W. (12 January 2015). "Frustrated Lewis Pair Activation of an N-Sulfinylamine: A Source of Sulfur Monoxide". Angewandte Chemie International Edition. 54 (3): 809–812. doi:10.1002/anie.201409969. PMID 25376102.
  5. Kresze, G.; Maschke, A.; Albrecht, R.; Bederke, K.; Patzschke, H. P.; Smalla, H.; Trede, A. (February 1962). "Organic N-Sulfinyl Compounds". Angewandte Chemie International Edition in English. 1 (2): 89–98. doi:10.1002/anie.196200891.
  6. Romano, R.M; Della Védova, C.O; Boese, R (January 1999). "A solid state study of the configuration and conformation of OSN–R (R=C6H5 and C6H3(CH3–CH2)2-2,6)". Journal of Molecular Structure. 475 (1): 1–4. Bibcode:1999JMoSt.475....1R. doi:10.1016/S0022-2860(98)00439-6.
  7. Ammoscato, Vince (1990). "Part I. A study of the alkylation chemistry of N-sulfinyl amines. Part II. Attempted preparation of the camphor imine of stereospecifically deuterated glycine". Electronic Theses and Dissertations. University of Windsor. Retrieved 28 January 2018.
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