Synthesis of allenyl- and alkynyl-stannanes by reduction of allenyl- and alkynyl-chlorostannanes

Acidity Trends in α,β‐Unsaturated Sulfur, Selenium, and Tellurium Derivatives: Comparison with C‐, Si‐, Ge‐, Sn‐, N‐, P‐, As‐, and Sb‐Containing Analogues

“…(8) and (9)]. [15] refer to the standard temperature of 298.15 K. The reported absolute D acid G are not corrected for the 338 to 298.15 K temperature change, as such corrections were assumed to be minor with respect to other experimental uncertainties.…”

“…Even for arsenic or tin, it is only quite recently that the corresponding derivatives have been synthesized. [5][6][7][8] On the other hand, the high reactivity of other heterocomAbstract: The gas-phase acidity of CH 3 ÀCH 2 XH (X = S, Se, Te), CH 2 =CHXH (X = S, Se, Te) and PhXH (X = S, Se) compounds was measured by means of Fourier transform ion cyclotron resonance mass spectrometry. To analyze the role that unsaturation plays on the intrinsic acidity of these systems, a parallel theoretical study, in the framework of the G2 and the G2-(MP2) theories, was carried out for all ethyl, ethenyl (vinyl), ethynyl, and phenyl O-, S-, Se-, and Te-containing derivatives.…”

First synthesis and characterization of vinylselenols and vinyltellurols

“…Since 1994, we have been involved in the synthesis of primary low boiling a,b-or b,g-unsaturated phosphines, arsines, stibines, stannanes and mercury hydrides. 3,[9][10][11][12] We have developed an efficient procedure for the preparation of these compounds using vacuum line techniques, via the reduction of the corresponding halo derivatives with excess tributyltin hydride. This approach cannot be used to prepare SH, SeH or TeH derivatives because these products would quickly react with the tin hydride to form the corresponding S-Sn, Se-Sn or Te-Sn derivatives.…”

“…§ In the 1 H NMR spectrum, the presence of an unsaturated group on a heteroatom usually leads to a downfield shift of the signals of hydrogen(s) attached to the heteroatom and an increase in the coupling constants. 9,11 In the 1 H NMR spectra of selenols 3a-c, the signal of the hydrogen on the selenium atom was observed ca. 1.5 ppm downfield to that of the saturated derivative (Table 1).…”

The ground-state rotational spectrum and molecular geometry of ethynylstannane

“…In the last decade some of the simplest derivatives have been synthesized, such as ethynylarsine, 1 ethynylstibine, 2 or ethynylstannane. 3 Although all of these compounds are kinetically more stable than the corresponding oxygen (ethynol) 4 and nitrogen derivatives (ethynamine), 5 they are quite difficult to prepare and should be kept at low temperature even when diluted in a solvent. The photoelectron spectra of the derivatives of the column 15 elements of the periodic table showed that the destabilizing interaction of four electrons (p CRC -lone pair) decreased on going from the nitrogen to the arsenic derivative.…”