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2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (or DDQ) is the chemical reagent with formula C 6 Cl 2 (CN) 2 O 2. This oxidant is useful for the dehydrogenation of alcohols, [3] phenols, [4] and steroid ketones. [5] DDQ decomposes in water, but is stable in aqueous mineral acid. [6]
(1) Fmoc-protected amino group, (2) benzyl ester protected carboxyl group and (3) tert-butyl ether protected phenolic hydroxyl group of Tyrosine. Orthogonal protection is a strategy allowing the specific deprotection of one protective group in a multiply-protected structure.
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The Op. 63 Mazurkas by Frédéric Chopin are a set of three mazurkas for solo piano written in 1846 and published in 1847. These were Chopin's last set of mazurkas published during his lifetime. They demonstrate the composer's "late" style and may suggest a maturity of his emotional approach to the mazurka as a musical form. [1]
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The Piano Sonata in C-sharp minor, Op. posth. 80, was written by Russian composer Pyotr Ilyich Tchaikovsky in 1865, his last year as a student at the St Petersburg Conservatory. The sonata in its original form was not published in Tchaikovsky's lifetime; it was published in 1900 by P. Jurgenson, and given the posthumous opus number 80. [1]
Engraved portrait of Dussek, published in 1867. This is a list of compositions by Jan Ladislav Dussek.. Cataloging Dussek's compositions has a history of its own. Dussek's oeuvre has historically been difficult to organize, due in part to the number of publishers who originally published his work, and to the fact that some of his works were published by more than one publisher.
The Rondo in C minor, Op. 1, for solo piano is Chopin's first published work, published in 1825, [1] and dedicated to "Madame de Linde", the wife of the headmaster of the Lyceum at which Chopin was studying. [2] The piece contains an "unorthodox (but entirely logical) tonal scheme". [1]