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The influence of pressure on [2 +-21 cycloaddition reactions of a,P-unsaturated Fischer carbene complexes (M = Cr, W) with 3,4-dihydro-2H-pyran was studied. The cycloaddltion was found to be sensitive toward pressure and showed a remarkable rate acceleration independent of the metal center. The temperature, pressure, and solvent dependence of these reactions was

3D‐nanostructured ensembles of silicon nanocrystals forming inverse opals, directly prepared by magnesioreduction, exhibited intense photoluminescence in a broadband range (visible and NIR). Light emission, which strongly diminished under photoexcitation, was preserved by engineering the nanocrystals interface with atomic layer deposition of alumina. The high accessibility of the nanocrystals throughout the self‐supported structure was a key factor for efficient photoluminescence stabilization.

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