2-isocyanato-1,1-dimethoxyethane

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 20 ml of acetonitrile was suspended 3.2 g of benzaldehyde 4-(4-chloro-α-cyanobenzyl)-3,5-dichlorophenyl hydrazone. To the suspension were added 1.5 g of 2,2-dimethoxyethyl isocyanate and 20 mg of DBU. The reaction was allowed to proceed for one hour at room temperature, then the resulting crystalline precipitate was collected by filtration, which was washed with hexane, followed by drying to afford 3.7 g of the titled compound as colorless crystals, m.p.190-191° C. the resulting crystalline precipitate was collected by filtration, which was washed with hexane by drying

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 20 ml of acetonitrile was suspended 3.2 g of benzaldehyde 4-(4-chloro-α-cyanobenzyl)-3,5-dichlorophenyl hydrazone. To the suspension were added 1.5 g of 2,2-dimethoxyethyl isocyanate and 20 mg of DBU. The reaction was allowed to proceed for one hour at room temperature, then the resulting crystalline precipitate was collected by filtration, which was washed with hexane, followed by drying to afford 3.7 g of the titled compound as colorless crystals, m.p.190-191° C. the resulting crystalline precipitate was collected by filtration, which was washed with hexane by drying

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 20 ml of acetonitrile was suspended 3.2 g of benzaldehyde 4-(4-chloro-α-cyanobenzyl)-3,5-dichlorophenyl hydrazone. To the suspension were added 1.5 g of 2,2-dimethoxyethyl isocyanate and 20 mg of DBU. The reaction was allowed to proceed for one hour at room temperature, then the resulting crystalline precipitate was collected by filtration, which was washed with hexane, followed by drying to afford 3.7 g of the titled compound as colorless crystals, m.p.190-191° C. the resulting crystalline precipitate was collected by filtration, which was washed with hexane by drying

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 20 ml of acetonitrile was suspended 3.2 g of benzaldehyde 4-(4-chloro-α-cyanobenzyl)-3,5-dichlorophenyl hydrazone. To the suspension were added 1.5 g of 2,2-dimethoxyethyl isocyanate and 20 mg of DBU. The reaction was allowed to proceed for one hour at room temperature, then the resulting crystalline precipitate was collected by filtration, which was washed with hexane, followed by drying to afford 3.7 g of the titled compound as colorless crystals, m.p. 190-191° C. the resulting crystalline precipitate was collected by filtration, which was washed with hexane by drying

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 15 ml of acetonitrile was suspended 1.00 g of 1-benzylidene-2-{4-[4-(4-chlorobenzoyl)benzyl]-3,5-dichlorophenyl}hydrazine, and 0.40 g of 2,2-dimethoxyethyl isocyanate was added, and then 15 ml of DBU(1,8-diazabicyclo[5.4.0]undec-7-ene) was added. The mixture was reacted at 20 to 25° C. for 1 hour, and precipitated crystals were collected by filtration to give the above-identified compound as colorless crystals (yield: 75%). was added The mixture was reacted at 20 to 25° C. for 1 hour precipitated crystals were collected by filtration

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 20 ml of acetonitrile was suspended 3.2 g of benzaldehyde 4-(4-chloro-α-cyanobenzyl)-3,5-dichlorophenyl hydrazone. To the suspension were added 1.5 g of 2,2-dimethoxyethyl isocyanate and 20 mg of DBU. The reaction was allowed to proceed for one hour at room temperature, then the resulting crystalline precipitate was collected by filtration, which was washed with hexane, followed by drying to afford 3.7 g of the titled compound as colorless crystals, m.p.190-191° C. the resulting crystalline precipitate was collected by filtration, which was washed with hexane by drying