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4 C 3 H 4 N 2 + C(O)Cl 2 → (C 3 H 3 N 2) 2 CO + 2 [C 3 H 3 N 2 H 2]Cl. In this conversion, the imidazole serves both as the nucleophile and the base. An alternative precursor 1-(trimethylsilyl)imidazole requires more preparative effort with the advantage that the coproduct trimethylsilyl chloride is volatile. CDI hydrolyzes readily to give ...
Flask, 1925-1930. Sterling silver and cork, 9 5/8 x 4 1/2 x 1 3/16in. (24.4 x 11.4 x 3cm). Brooklyn Museum, Modernism Benefit Fund. The Napier Company is an American jewelry manufacturing company, and was one of the first modern corporations in the United States. The company is also known historically as a cutting-edge silver object ...
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Fictional gemstones and jewelry (2 C, 20 P) I. Individual pendants (8 P) N. Necklaces (4 C, 54 P) R. Rings (jewellery) (2 C, 58 P) Rosary (2 C, 30 P) W. Watches (8 C ...
[2] Earring components may be made of any number of materials, including metal, plastic, glass, precious stone, beads, wood, bone, and other materials. Designs range from small hoops and studs to large plates and dangling items. The size is ultimately limited by the physical capacity of the earlobe to hold the earring without tearing.
Jewellery design is the art or profession of designing and creating jewellery. It is one of civilization's earliest forms of decoration , dating back at least 7,000 years to the oldest-known human societies in Indus Valley Civilization , Mesopotamia , and Egypt .
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