Dr. Steven Welch
Dr. Steven Welch
Professor of Chemistry

Office: SCI II 333
Phone: 760-750-4136
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Professor Welch earned his B.S. degree in Chemistry at UCLA, Ph.D. at USC, and Post Doc at CalTech.  He was a Professor of Chemistry & Pharmacy at the University of Houston for 20 years before becoming the Founding Faculty of the Department of Chemistry & Biochemistry at CSUSM.


"An Acid Catalyzed Rearrangement of Derivatives of Blocked  Oxocycloheptane- acetic Acids to Spirobutenolides", Roberts, B.W.; Welch, S.C.; Steed, D.A. Chem. Commun.  1969, 535-536.
 
"Total Synthesis of Culmorin", Roberts, B.W.; Poonian, M.S.; Welch, S.C., J. Am. Chem. Soc.  1969, 91, 3400-3401.
 
"The Total Synthesis of Alnusenone", Ireland, R.E.; Welch, S.C.  J. Am. Chem. Soc.  1970, 92, 7232-7234.
 
"Experiments Directed Toward The Total Synthesis of Terpenes XVII", Ireland, R.E.; Baldwin, S.W.; Welch, S.C.  J. Am. Chem. Soc.  1972, 94, 2056-2066.
 
"Preparation of Diethylaluminum Cyanide", Nagata, W.; Yosioka, M.; Welch, S.C.; Bey, P.; Ireland, R.E.  Org. Syn.  1972, 52, 90-95.
 
"A Synthetic Precursor of Trichodermin", Welch, S.C.; Wong, R.Y.  Tetrahedron Letters.  1972, 1853-1856.

"A Synthetic Intermediate for Trichothecane Phytotoxic Sesquiterpenoids", Welch, S.C.; Wong, R.Y.  Syn. Commun.  1972, 2, 291-295.

¿Experiments directed toward the total synthesis of terpenes based upon a mechanistic interpretation of the stereochemical outcome of the Friedel-Crafts cyclialation¿, Ireland,R. E., Baldwin S. W., Welch, S.C.  J. Am. Chem. Soc. 1972, 94, 2056-2066.

"Experiments Directed Toward the Total Synthesis of Terpenes XVIII", Ireland, R.E.; Dawson, M.I.; Welch, S.C.; Hagenbach, A.; Bordner, J.; Trus, B.   J. Am. Chem. Soc.  1973, 95, 7829-7841.

"A New Stereoselective Method for Developing Ring A of  Podocarpic Acid Compounds", Welch, S.C.; Hagan, C.P.  Syn. Commun.  1973, 3, 221-225.

"A Total Synthesis of Longicyclene", Welch, S.C.; Walters, R.L.  Syn. Commun.  1973, 3, 15-18.
 
"A Stereoselective Synthesis of Podocarpic Acid", Welch, S.C.; Hagan, C.P.  Syn. Commun.  1973, 3, 29-32.

"Total Syntheses of Longicamphor and Longiborneol", Welch, S.C.; Walters, R.L.  Syn. Commun.  1973, 3, 419-423.
 
"Stereoselective Total Syntheses of Longicyclene, Longicamphor, and Longiborneol", Welch, S.C.; Walters, R.L. J.  Org. Chem. 1974, 39, 2665-2673.

"A Total Synthesis of the Antifungal Mold Metabolite LL-Z1271[alpha]", Welch, S.C.; Hagan, C.P.; White, D.H.; Fleming, W.F.  Syn. Commun.  1974, 4, 373-378.


"A Total Synthesis of Callitrisic Acid", Welch, S.C.; Kim, J.H.  Syn. Commun.  1976, 6, 27-31.

"A Total Synthesis of Trichodiene", Welch, S.C.; Rao, A.S.C.P.; Wong, R.Y.  Syn. Commun.  1976, 6, 443-445.
 
"A Stereoselective and Regioselective Total Synthesis of Trichodiene", Welch, S.C.; Rao, A.S.C.P.; Gibbs, C.G.  Syn. Commun.  1976, 6, 485-488.
 
"A Stereoselective Total Synthesis of the Antifungal Mold Metabolite LL-Z1271[alpha]", Welch, S.C.; Hagan, C.P.; White, D.H.; Fleming, W.P.; Trotter, J.W.  J. Am. Chem. Soc.  1977, 99, 549-556.
 
"Stereoselective Total Syntheses of Zonarol and Isozonarol", Welch, S.C.; Rao, A.S.C.P.  Tetrahedron Letters.  1977, 505-508.
 
"A Synthesis of trans -Chrysanthemic Acid", Welch, S.C.; Valdes, T. A.  J. Org. Chem.  1977, 42, 2108-2111.
 
"Stereoselective Total Syntheses of Resin Acids", Welch, S.C.; Hagan, C.P.; Kim, J.H.; Chu, P.S.  J. Org.Chem.  1977, 42, 2879-2887.

"Stereoselective Total Syntheses of Fungitoxic Hydroquinones Zonarol and Isozonarol", Welch, S.C.; Rao, A.S.C.P.  J. Org. Chem.  1978, 43, 1957-1961.

"Reduction of Enolphosphates with Titanium Metal", Welch, S.C.; Walters, M.E.  J. Org. Chem.  1978, 43, 2715-2717.
 
"Reduction of Aryl Diethyl Phosphates with Titanium Metal: A Method for Deoxygenation of Phenols", Welch, S.C.; Walters, M. E.  J. Org. Chem.  1978, 43, 4797-4799.
 
"A Convenient One-Step Synthesis of 2,2-Disubstituted Oxetanes from Ketones", Welch, S.C.; Rao, A.S.C.P.  J. Am. Chem. Soc.  1979, 101, 6135-6136.
 
"A Stereoselective Total Synthesis of Gymnomitrol", Welch, S.C.; Chayabunjonglerd, S.  J. Am. Chem. Soc.  1979, 101, 6768-6769.
 
"The Synthesis and Activity of Sulfur and Selenium Isosteric Substitution Analogues of Retinol", Welch, S.C.; Gruber, J.M.  J. Med. Chem.  1979, 22, 1532-1534.
 
"Epoxidation of Retinol and the Structure of 'Chromogen 574", Welch, S.C.; Gruber, J.M.; Rao, A.S.C.P.  Tetrahedron.  1980, 36, 1179-1182.

"Stereoselective Total Synthesis of Trichodiene: Biogenetic Precursor of the Trichothecane Sesquiterpenoids", Welch, S.C.; Rao, A.S.C.P.; Gibbs, C.G.; Wong, R.Y.  J. Org. Chem.  1980, 45, 4077-4085.
 
"Stereoselective Total Syntheses of Gymnomitrol and Gymnomitrene", Welch, S.C.; Chayabunjonglerd, S.; Rao, A.S.C.P.  J. Org. Chem.  1980, 45, 4086-4093.

"Reduction of Phenylthiomethylcarbinyl Benzoate Esters to Alkenes with Titanium Metal", Welch, S.C.; Loh, J.-P.  J. Org. Chem.  1981, 46, 4072-4074.

"A Synthesis of Seychellene and the Original Structure Reported for Cyclo-seychellene", Welch, S.C.; Gruber, J.M.; Chou, C.-Y., Willcott, M.R.; Inners, R.R.  J. Org. Chem.  1981, 46, 4816-4817.

"Cycloseychellene: A Structural Revision", Willcott, M.R.; Morrison, P.A.; Assercq, J.-M., Welch, S.C.; Inners, R.R.  J. Org, Chem.  1981, 46, 4819-4820.
 
"Syntheses and Activities of Antioxidant Derivatives of Retinoic Acid", Welch, S.C.; Gruber, J.M.; Rao, A.S.C.P.  J. Med. Chem.  1982, 25, 81-84.
 
"Synthesis of C-13 Substituted Retinoic Acid Analogues", Welch, S.C.; Gruber, J.M.  J. Org. Chem.  1982, 47, 385-389.
 
"A Synthesis of 2,2-Disubstituted Oxetanes from Ketones with Sodio Dimethyl N-(p-tolylsulfonyl)-sulfoximine", Welch, S.C.; Rao, A.S.C.P.; Lyon, J.T.; Assercq, J.-M.  J. Am. Chem. Soc.  1983, 105, 252-257.
 
"Total Syntheses of Cycloseychellene and Seychellene", Welch, S.C.; Gruber, J.M.; Morrison, P.A.  Tetrahedron Letters.  1984, 25, 5497-5500.
 
"Reductive Dephosphorylation of Z-bis-(Diethylphosphoro)Stilbene to Diphenyl- acetylene", Welch, S.C.; Kabay, M.C.  J. Org. Chem.  1985, 50, 136-139.
 
"Total Syntheses of Seychellene, Isocycloseychellene, and Isoseychellene", Welch, S.C.; Chou, C.-Y.;Gruber, J.M.; Assercq, J.-M.  J. Org Chem.  1985, 50, 2668-2676.
 
"Total Syntheses of Seychellene and Cycloseychellene", Welch, S.C.; Gruber, J.M.; Morrison, P.A.  J. Org. Chem.  1985, 50, 2676-2681.

"A New Reagent for a 'One-Pot' Cyclopentenone Annelation", Welch, S.C.; Assercq, J.-M.; Loh, J.-P.  Tetrahedron Letters.  1986, 27,1115-1118.

"Computer Assisted Organic Structure Determination" (Twenty Computer programs for the Apple Macintosh Computer which assist students in learning how to interpret spectroscopic data for the molecular structure determination.)  Welch, S.C.; Boucher, J.L., U.S. Copyright, 1986.

"3-Chloro-2-diethylphosphoryloxy-1-propene; A New Reagent  for  a 'One-Pot'  Cyclopentenone Annelation: Syntheses of Desoxyallethrolone, cis-Jasmone, and Methylenomycin-B", Welch, S. C.; Assercq, J.-M.; Loh, J.-P.; Glase, S. A.  J. Org. Chem.  1987, 52, 1440-1450.

"A Very Brief, Rapid, Simple, and Unified Method for Estimating Carbon-13 NMR Chemical Shifts: The B. S. Method", Shoulders, B.; Welch, S.C.  J. Chem. Ed.  1987, 64, 915-918.

"Mapping Highly Congested Proton NMR Spin Systems of Natural Products Using Two-Dimensional Proton Double Quantum Inadequate", Martin, G. E.; Welch, S. C.  Spectroscopy Letters.  1988, 21, 77-88.

"The Stereochemistry of the Aryl Phosphate / Aryl Phosphonate Rearrangement in 1,3,2-Oxazaphospholidine-2-oxides", Welch, S. C.; Levine, J. A.  J. Org. Chem.  1990, 55, 5991-5995.

"Development of New Antitumor Anthracyclenes", Welch, S.C.; Levine, J.A.; Arimilli, M. N.  Synthetic Communications.  1993, 23, 131-134.