फोटोकेमिकी इसके अंग्रेजी अर्थ का उदाहरण

This intermediate element is exposed and chemically processed to a photographic gamma that will permit duplicate negatives as close to the original as is possible by a photochemical process.

Although more of a useful heuristic than a rule, a corresponding generalized selection principle for photochemical pericyclic reactions can be stated: A pericyclic process involving N electron pairs and A antarafacial components is often favored under photochemical conditions if N + A is even.

The researchers use kinetic and photochemical laboratory investigations, in situ and remote sensing measurements.

Benzyl chloride is prepared industrially by the gas-phase photochemical reaction of toluene with chlorine:.

It was found that 4n-electron thermal and (4n + 2)-electron photochemical electrocyclic reactions were conrotatory in general, while 4n-electron photochemical and (4n + 2)-electron thermal electrocyclic reactions were disrotatory in general.

PAA is also formed naturally in the environment through a series of photochemical reactions involving formaldehyde and photo-oxidant radicals.

The Woodward–Hoffmann rules were first formulated in 1965 to explain the striking stereospecificity of electrocyclic reactions under thermal and photochemical control.

In a photochemical reaction an electron in the HOMO of the reactant is promoted to an excited state leading to a reversal of terminal symmetry relationships and stereospecificity.

In particular, α-P4S5 can be easily made by the photochemical reaction of P4S10 with red phosphorus.

When the two ends rotate in opposing directions (one clockwise, one counterclockwise — as in the photochemical ring closing of 5), the process is termed disrotatory.

In the atmosphere, vapor phase fenthion reacts rapidly with photochemically produced hydroxyl radicals, and its half-life is about 5 hours.

The compound tetradehydrodianthracene, also with a 35° pyramidalization angle, is synthesized in a photochemical cycloaddition of bromoanthracene followed by elimination of [bromide].