The Butanal, with the CAS registry number 123-72-8 and EINECS registry number 204-646-6, is the aldehyde derivative of butane. It is a colourless flammable liquid with an acrid smell, and miscible with most organic solvents. The molecular formula of this chemical is C₄H₈O.

The physical properties of Butanal are as followings: (1)ACD/LogP: 0.91; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 0.91; (4)ACD/LogD (pH 7.4): 0.91; (5)ACD/BCF (pH 5.5): 2.88; (6)ACD/BCF (pH 7.4): 2.88; (7)ACD/KOC (pH 5.5): 74.13; (8)ACD/KOC (pH 7.4): 74.13; (9)#H bond acceptors: 1; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 17.07 Å²; (13)Index of Refraction: 1.369; (14)Molar Refractivity: 20.76 cm³; (15)Molar Volume: 91.8 cm³; (16)Polarizability: 8.23×10^-24cm³; (17)Surface Tension: 22.5 dyne/cm; (18)Density: 0.784 g/cm³; (19)Enthalpy of Vaporization: 31.86 kJ/mol; (20)Boiling Point: 77.6 °C at 760 mmHg; (21)Vapour Pressure: 96 mmHg at 25°C.

Preparation of Butanal: It can be prepared by the catalytic dehydrogenation of n-butanol. And at one time, it was produced industrially by the catalytic hydrogenation of crotonaldehyde, which is derived from acetaldehyde. It is produced almost exclusively by the hydroformylation of propylene
CH₃CH=CH₂ + H₂ + CO → CH₃CH₂CH₂CHO

Uses of Butanal: It is an important intermediate used in plasticizers, synthetic resins, rubber accelerators and pesticides. It is also a kind of important chemical raw material which is used for the preparation of flavor & aromas.

You should be cautious while dealing with this chemical. It is a kind of highly flammable chemical. Therefore, you had better take the following instructions: Keep container in a well-ventilated place; Do not keep the container sealed; Take precautionary measures against static discharges.

You can still convert the following datas into molecular structure:
(1)SMILES: O=CCCC
(2)InChI: InChI=1/C4H8O/c1-2-3-4-5/h4H,2-3H2,1H3
(3)InChIKey: ZTQSAGDEMFDKMZ-UHFFFAOYAZ

The toxicity data is as follows: