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a low-cut neckline, cleavage. In French it means: 1. action of lowering a female garment's neckline; 2. Agric.: cutting leaves from some cultivated roots such as beets, carrots, etc.; 3. Tech. Operation consisting of making screws, bolts, etc. one after another out of a single bar of metal on a parallel lathe.
The Erlenmeyer–Plöchl azlactone and amino acid synthesis, named after Friedrich Gustav Carl Emil Erlenmeyer who partly discovered the reaction, is a series of chemical reactions which transform an N-acyl glycine to various other amino acids via an oxazolone (also known as an azlactone). [1] [2] Azlactone chemistry: step 2 is a Perkin variation
The 1,3-dipolar cycloaddition is a chemical reaction between a 1,3-dipole and a dipolarophile to form a five-membered ring. The earliest 1,3-dipolar cycloadditions were described in the late 19th century to the early 20th century, following the discovery of 1,3-dipoles.
In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical reaction occurs. [1]A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction.
Arrow pushing or electron pushing is a technique used to describe the progression of organic chemistry reaction mechanisms. [1] It was first developed by Sir Robert Robinson.In using arrow pushing, "curved arrows" or "curly arrows" are drawn on the structural formulae of reactants in a chemical equation to show the reaction mechanism.
A number of adjectives (often having to do with beauty, age, goodness, or size, a tendency summarized by the acronym "BAGS"), come before their nouns: une belle femme ("a beautiful woman"). With a few adjectives of the latter type, there are two masculine singular forms: one used before consonants (the basic form), and one used before vowels.
The AP French Language test is widely compared to a final examination for a French 301 college course. Enrollment requirements for AP French Language differ from school to school, but students wishing to enter it should have a good command of French grammar and vocabulary as well as prior experience in listening, reading, speaking, and writing ...
Elimination reaction of cyclohexanol to cyclohexene with sulfuric acid and heat [1] An elimination reaction is a type of organic reaction in which two substituents are removed from a molecule in either a one- or two-step mechanism. [2] The one-step mechanism is known as the E2 reaction, and the two-step mechanism is known as the E1 reaction ...