在配有磁力搅拌器、温度计、回流冷凝管的1000ml三口圆底烧瓶中，依次

In a 1000ml three-necked round bottom flask equipped with a magnetic stirrer, thermometer, and reflux condenser, add 136.234g (1mol) of camphene with a content of 84.6%, 36.036g of paraformaldehyde (1.2mol), and 292.859g of glacial acetic acid, Heat to 1400C and reflux for 18-24h. After the reaction, the reaction solution was heated to 1400C to distill off the unreacted glacial acetic acid and recover it. The residual liquid in the round bottom flask was cooled and poured into 400ml of water. After stirring, the oil layer was separated and the water layer was extracted with 3 * 50ml of petroleum ether. The organic phases were combined and saturated sodium carbonate solution was added to make it neutral. The water layer; the oil layer was washed with 10% sodium chloride solution to separate the organic phase and dried with anhydrous sodium sulfate for 4h, dried and filtered. Transfer the liquid to a 500ml round-bottom flask, distill off petroleum ether under normal pressure, wait for the liquid to cool, then perform vacuum distillation,

In 1000 ml round-bottom edgs equipped with magnetic agitators, thermometers and reflux condensers, the content of cesium 136.234g (1mol), 36.036g polyformaldehyde (1.2mol), 292.859g of cyformic acid is added to 1400C and refluxed 18-24h. After the reaction is completed, the reaction fluid is heated to 1400C distilled to produce the unreflected ice acetic acid and recovered. After cooling the residual liquid in the round bottom flask, pour into 400 ml of water, stir and leave the oil layer in a static solution, the water layer is extracted with 3 x 50 ml of petroleum ether, combined with the organic phase and added saturated sodium carbonate solution to make it neutral, divided out of the water layer; Transfer the liquid to a 500ml round-bottomed flask, steam ingliated out of the oil ether under normal pressure, and let the liquid cool down and desify under reduced pressure.

In a 1000ml three port round bottom flask equipped with a magnetic stirrer, a thermometer and a reflux condenser, 136.234g (1mol) camphene, 36.036g (1.2mol) paraformaldehyde and 292.859g glacial acetic acid with 84.6% content were successively added, heated to 1400C and refluxed for 18-24h. After the reaction, the reaction solution was heated to 1400C, and the unreacted glacial acetic acid was distilled out and recovered. Cool the residual liquid in the round bottom flask, pour it into 400ml water, stir it and leave it still to separate the oil layer, extract the water layer with 3 * 50ml petroleum ether, combine the organic phase and add saturated sodium carbonate solution to make it neutral, separate the water layer; wash the oil layer with 10% sodium chloride solution to separate the organic phase and dry it with anhydrous sodium sulfate for 4h, dry and filter. Transfer the liquid to a 500ml round bottom flask, evaporate and slide out the petroleum ether under normal pressure, and conduct vacuum distillation after the liquid cools,<br>