METHOXYFLURANE Synthesis, SAR, MCQ,Structure,Chemical Properties and Therapeutic Uses


IUPAC nomenclature



Methoxyflurane is an inhalational anesthetic.


Physiochemical Properties

1 Molecular weight 169.96 g/mol
2 Physical appearance Clear colorless liquid
3 Boiling point 105°C
4 Solubility 28,300 mg/L in water at room temperature.
5 Octanol/water partition coefficient 2.21
6 Presence of ring Not present
7 Number of chiral centers Not present


Mechanism of Action

  • Methoxyflurane decreases the gap junction channel opening times and increases gap junction channel closing time which induces reduction in junctional conductance.
  • The drug also increases the fluidity of the lipid membrane and thus, activates calcium dependent ATPase in the sarcoplasmic reticulum.
  • Methoxyflurane also binds with D subunit of ATP synthase, GABA receptors, glutamate receptors , glycine receptors, the large conductance Calcium ion activated potassium channel and NADH dehydrogenase.


Structure Activity Relationship

The SAR for inhaled anesthetics can be summarized as follows:

  • Halogenations of the hydrocarbons and ether increase the anesthetic potency.
  • Halogenations of the hydrocarbons tends to induce arrhythmia in the following order F<Cl<Br<I.
  • Due to presence of asymmetric halogenated carbon in ether, they are better anesthetics.
  • Halogenated methyl ethyl ethers are more stable, more potent and have better clinical profile than halogenated diethyl ether.
  • Fluorination increases the stability and decreases the flammability.
  • Compete halogenations of the alkane or ether decreases the anesthetic potency and increases the convulsant potency
  • Presence of double bond increases chemical reactivity and toxicity.


Method of synthesis

i. 1,1-difluoro-2,2,2-trichloroethane undergoes dehydrochlorination by help of potassium hydroxide to produce 1,1-dichloro-2,2-difluoroethylene.

ii. Methanol is added to the above formed compound in the presence of potassium hydroxide. [1]


Therapeutic Uses

Methoxyflurane is used for:

  • Relieving moderate to severe pains


Side Effects

Side effects of Methoxyflurane are: 

  • Nephrotoxicity
  • Severe to fatal hepatotoxicity



Q.1 What can be the correct IUPAC nomenclature of methoxyflurane?

a) 2,2-dichloro-1,1-difluoro-1-methoxyethane

b) 5-Ethyl-5-phenyl-1,3-diazinane-4,6-dione

c) (RS)-1,3-dimethyl-3-phenyl-pyrrolidine-2,5-dione

d) 2-chloro-1,1-difluoro-1-methoxyethane

Q.2 Which amongst the following statements is/are incorrect related to the SAR of Inhaled anesthetics?

I. Due to presence of asymmetric halogenated carbon in ether, they are better anesthetics.

II. Halogenated methyl ethyl ethers are less stable, more potent and have better clinical profile than halogenated diethyl ether.

III. Fluorination increases the stability and increases the flammability.

a) I, II

b) I

c) III

d) II, III

Q.3 Methoxyflurane can be synthesized by reaction of 1,1-dichlroo-2,2-difluoroethylene with ?

a) Methanol

b) Ethyl alcohol

c) Propanol

d) Ethanoic acid

Q.4 Side effects of drug Methoxyflurane is/are?

a) Shallow breathing

b) Decreased libido

c) Nephrotoxicity

d) All of the above

Q.5 Match the following drugs with their correct molecular weight.

i. Methoxyflurane A. 373.9 gm/mol
ii. Prochlorperazine B. 169.96 gm/mol
iii. Phenytoin C. 407.5 gm/mol
iv. Trifluperazine D. 296.5 gm/mol

a) i-A, ii-D, iii-C, iv-B

b) i-B, ii-A, iii-D, iv-C

c) i-A, ii-C, iii-D, iv-B

d) i-D, ii-C, iii-A, iv-B

Q.6 An example of drug from class Inhalational Anesthetics is?

a) Primidone

b) Methoxyflurane

c) Ephedrine

d) Amphetamine 

Q.7 The type of ring system found in the structure of Methoxyflurane is?

a) Pyridine

b) Pyrimidine

c) Cyclohexane

d) None


For More Standard and Quality Question Bank you can Join Our Test Series Programme for GPAT, NIPER JEE, Pharmacist Recruitment Exam, Drug Inspector Recruitment Exams, PhD Entrance Exam for Pharmacy

Participate in Online FREE  GPAT  TEST: CLICK HERE

  Participate in Online FREE  Pharmacist  TEST: CLICK HERE 

Participate in Online FREE  Drug Inspector  TEST: CLICK HERE 












[1] ] Vardanyan R, Hruby V. Synthesis of essential drugs. Elsevier; 2006 Mar 10.

Leave a Reply

Your email address will not be published. Required fields are marked *

eight + 5 =

Designed & Developed by ThemeXpert