Heterocycles

Heterocycles Property

Boiling point:

208.5±13.0 °C(Predicted)

Density 

1.020±0.06 g/cm3(Predicted)

storage temp. 

Sealed in dry,Room Temperature

Appearance

Colorless to light yellow Liquid

Safety

HS Code 

2932990090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P312Call a POISON CENTER or doctor/physician if you feel unwell.

P321Specific treatment (see … on this label).

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P337+P313IF eye irritation persists: Get medical advice/attention.

P362Take off contaminated clothing and wash before reuse.

P403+P233Store in a well-ventilated place. Keep container tightly closed.

P405Store locked up.

P501Dispose of contents/container to..…

Heterocycles Chemical Properties,Usage,Production

Synthesis

GENERAL PROCEDURE: Methyl 2-(dihydro-2H-pyran-4(3H)-ylidene)acetate (7.06 mmol) was dissolved in methanol (7 mL, 1.0 M) and the solution was cooled to 0 °C. Subsequently, 10% Pd/C catalyst (2.12 mmol) was added and methanol (55 mL) was made up. Ammonium formate (35.3 mmol) was added in batches and then the reaction mixture was heated to 90 °C. After 90 minutes of reaction, the mixture was cooled to room temperature and filtered through diatomaceous earth. The filtrate was concentrated under vacuum to afford methyl 2-(tetrahydro-2H-pyran-4-yl)acetate, which was used in subsequent steps without further purification.

References

[1] Australian Journal of Chemistry, 2015, vol. 68, # 4, p. 660 - 679
[2] Patent: WO2004/113298, 2004, A1. Location in patent: Page 29-30
[3] Patent: WO2004/113312, 2004, A1. Location in patent: Page 23
[4] Patent: US2005/26916, 2005, A1. Location in patent: Page/Page column 73