Explanipedia

α-Oxosulfines: reactions with alkenes and alkynes Open

I. W. J. STILL, D. K. T. WILSON · 1992

Thiochroman-4-one 1,1-dioxide has been successfully converted into 3-sulfinylthiochroman-4-one 1,1-dioxide and the reactions of this α-oxosulfine with a series of alkenes have been carefully investigated. The α-oxosulfine was found to reac…

Approaches to the tetracyclic eudistomins: the synthesis of N(10)-acetyleudistomin L Open

I. W. J. STILL, Juris R. Strautmanis · 1990

The successful synthesis of the tetracyclic ring system present in eudistomins C, E, K, and L involves a convergent approach to N(10)-acetyleudistomin L from 5-bromo-N′-hydroxytryptamine and a suitably protected cysteinal derivative. Ring …

The synthesis and reactivity of α-oxosulfines Open

I. W. J. STILL, Donald V. Frazer, D. K. HUTCHINSON, Jeffery F. Sawyer · 1989

Thiochroman-4-one and cyclohexanone have been converted into the corresponding α-oxosulfines and the behaviour of these reactive intermediates with a range of alkenes and alkynes has been examined. In contrast to some earlier work, the maj…

The Synthesis of Eudistomins S and T: b-carbolines from the Tunicate Eudistoma olivaceum Open

I. W. J. STILL, James McNulty · 1989

libJtract -The syntheses of two k-arbnlines, eodistomins S and T, have been accomplished from tryptarnine precursors.Since the first reported activity against Her~es sim~lex virus, type I (HSV-l), by t,he tunicate (ancidian) organism Eudis…

A general route to the synthesis of 3-alkylidene derivatives of 4-thiochromanone 1,1-dioxide Open

I. W. J. STILL, Fred J. Ablenas · 1984

The reactions of the trimethylsilyl enol ethers of both 4-thiochromanone and 4-thiochromanone 1,1-dioxide with various carbonyl compounds complexed with titanium tetrachloride give moderate yields of the previously unknown 3-alkylidene con…

Chemical behavior of an α-azidosulfide, and the related sulfoxide and sulfone, in the tetrahydrothiophene series Open

I. W. J. STILL, William L. Brown, Robin J. Colville, Gerald Kutney · 1984

The thermal, photochemical, base-catalyzed, and Lewis acid-catalyzed reactivity of 2-azidotetrahydrothiophene (1a) and the related α-azidosulfoxide and sulfone have been found to lead to a number of interesting rearrangement products. The …

Conformational analysis and photochemical behavior of sulfoxides in the naphtho[1,2-b]thiopyran and naphtho[2,1-b]thiopyran series Open

I. W. J. STILL, Parkash C. Arora, S. K. HASAN, Gerald Kutney, Lawrence Y. T. Lo , et al. · 1981

The sulfoxides derived from 2,3-dihydro-4H-naphtho[1,2-b]thiopyran and its 4-phenyl and 4-oxo derivatives, as well as the analogous sulfoxides in the 2,3-dihydro-1H-naphtho[2,1-b]thiopyran series, have been synthesized and their structures…

Phosphorus Pentasulfide and Thiophosphoryl Bromide: Facile Reagents for the Reduction of Sulfines to Thiones Open

J.A.M. Kuipers, B. H. M. Lammerink, I. W. J. STILL, B. Zwanenburg · 1981

The reaction of malondiamides with disulfur dichloride: a reinvestigation Open

Gerald Kutney, I. W. J. STILL · 1980

The reactions of a series of N,N′-dialkyl and N,N′-diaryl malondiamides with disulfur dichloride have been reinvestigated. The claim, made almost 60 years ago. that the products of this reaction are dithioketones R 2 CS 2 , is shown to be …

Photochemical rearrangements of 2-azido-4-thiochromanone 1-oxide and 1,1-dioxide: formation of 2H-benzo[f]-1,2-thiazepine derivatives Open

I. W. J. STILL, T. S. LEONG · 1980

Photolysis of 2-azido-4-thiochromanone 1,1-dioxide in benzene or dichloromethane leads to the formation of 2H-benzo[f]-1,2-thiazepin-5-one 1,1-dioxide, in very good yield. In contrast, the photolysis of the analogous sulfoxide was much mor…

Correlation of the photoelectron and electronic spectra of thiochromones and thiochromanones with their electrochemical data Open

Rafik O. Loutfy, I. W. J. STILL, Michael Thompson, T. S. LEONG · 1979

The gas phase ionization potentials, electrochemical redox potentials and spectroscopic properties of a series of thiochroman-4-one and thiochromone derivatives have been studied. A dramatic shift in the energies of the lowest vacant and h…

Photochemical rearrangements of substituted thiochromanone sulfoxides Open

I. W. J. STILL, Parkash C. Arora, M.S. Chauhan, M.‐H. KWAN, M. T. Thomas · 1976

The photochemical behavior of a number of substituted derivatives of thiochroman-4-one 1-oxide has been examined. In contrast to the analogous sulfones these sulfoxides undergo a variety of photochemical rearrangements. At least three dist…

Carbon-13 nuclear magnetic resonance spectra of organic sulfur compounds. Comparison of chemical shifts for carbonyl and thiocarbonyl compounds in the pyrone, thiopyrone, and pyridone series Open

I. W. J. STILL, N. PLAVAC, David M. McKinnon, M.S. Chauhan · 1976

13 C nmr data have been obtained for a series of 2- and 4-pyrones and pyridones, and their sulfur-containing analogues. Correlations have been observed between the nature of the ring hetero-atom and the chemical shift difference (Δδ) for t…

6,8,8-Trimethyl-6-(o-methylthiobenzoyl)-4-thia-benzocyclooctenone. A Novel Product from the Attempted Base-catalyzed Methylation of 3-Methylthiochroman-4-one Open

I. W. J. STILL, M.S. Chauhan, M. T. Thomas · 1973

The structure of the unusual eight-membered cyclic ketone 3 obtained on treatment of 3-methylthiochroman-4-one with methyl iodide in the presence of potassium t-butoxide has been assigned on the basis of n.m.r. ( 13 C and 1 H), i.r., and m…

The Structures of the Trihydroxyflavans from the Acid-catalyzed Rearrangement and Dimerization of 3-Carene-2,5-dione Open

I. W. J. STILL, David J. Snodin · 1972

The structures of the trimethyl ethers of three of the four mechanistically probable trihydroxyflavans derived by acid-catalyzed rearrangement and dimerization of 3-carene-2,5-dione have been assigned on spectroscopic grounds and by analog…

Acetone-sensitized photodimenzation of 3-carene-2,5-dione Open

I. W. J. STILL, Chancey MacDonald, Young-Taig Oh · 1970

Ultraviolet irradiation of 3-carene-2,5-dione 1 in acetone has been found to yield three cyclobutanetype photodimers. A detailed spectroscopic study of these compounds has shown that the two most abundant dimers possess the head-to-head or…

Studies in the cycloheptane field Open

I. W. J. STILL · 1961

In Section I, some of the reactions of tropilidene (or cycloheptatriene) are described. Attempts to convert tropilidene directly into tropone, or the so far unknown tropyl alcohol, by employing a variety of common oxidative procedures, hav…

I. W. J. STILL YOU? Author Swipe