0 Measured inEtOH (c= 2) for undistilled compounds and corrected for small amounts of3-halo-3-phenyI-l-propynes.
The recorded rotations refer to conversionof optically pure (S)-l and …

In this paper a study on the reactivity of various heterocuprates [RCuY]MgX 1 towards 1‐alkynes
R′−C≡CH 2 in tetrahydrofuran is presented. In most cases a smooth cis addition was …

Allenylsilver(I) compounds, prepared in situ by addition of alkylsilver(I)-lithium bromide
complexes to butenynes, readily react with a variety of electrophiles. The produced compounds …

A number of (dialkylamino)allenes 2 have been obtained in excellent yields and in a
reasonable state of purity by isomerization of dialkyl‐2‐propynylamines 1 with potassium tert‐…

Diphenylketene undergoes photocycloaddition with N-methylthiophthalimide, N-methyldithiophthalimide
or xanthene-9-thione, to give a Spiro-adduct containing a thietan-2-one ring. …

α,β‐Unsaturated ketones are formed by reaction of aldehydes and ketones with
phenylethyne under the influence of boron trifluoride. When using aromatic aldehydes 2,4,6‐…

Second‐order rate constants, k 2 , of reactions of thiolates with several 1‐aryl‐2‐halogenoacetylenes
and 1‐halogeno‐2‐(2‐thienyl)acetylenes were measured in methanol‐water …

A large variety of α,β‐unsaturated esters has been prepared by addition of aldehydes and
ketones to 1‐alkynyl ethers under the catalytic influence of boron trifluoride‐ether. With …

Compounds of the general formula R 1 CH=C(SC 2 H 5 )S‐CH 2 C 2 ≡CR 2 (II) (with R 1 =H,
alkyl or aryl and R 2 =H or CH 3 ) prepared by metallation of dithioesters R 1 CH 2 C(=S)…

Stereoselective total syntheses of (±)-isotadeonal (20),(i)-polygodial (1),(±)-warburganal (2),
and (±)-muzigadial (4) are described starting from 4a-methylperhydronaphthalen-2-ones. …