chemistry

Oxybuprocaine

Oxybuprocaine is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Oxybuprocaine rather than just read about it. In short: Oxybuprocaine (INN), also known as benoxinate or BNX, is an ester-type local anesthetic, which is used especially in ophthalmology and otolaryngology. Oxybuprocaine is sold by Novartis under the brand names Novesine or Novesin.

Key takeaways

Oxybuprocaine belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Oxybuprocaine to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Oxybuprocaine from memory before moving on to harder problems.

Reference excerpt

Oxybuprocaine (INN), also known as benoxinate or BNX, is an ester-type local anesthetic, which is used especially in ophthalmology and otolaryngology. Oxybuprocaine is sold by Novartis under the brand names Novesine or Novesin. Safety for use in pregnancy and lactation has not been established.

Uses In ophthalmology in order to numb the surface of the eye (the outermost layers of the cornea and conjunctiva) for the following purposes: in order to perform a contact/applanation tonometry, for small operations, in order to remove small foreign objects from the uppermost layer of the cornea or conjunctiva; in otolaryngology for numbing the mucous membranes of the nostrils and pharynx, for diagnostic purposes and small operations, for numbing the mucous membranes of bronchi, for example in bronchoscopy,

Pharmacokinetics Anaesthesia starts with a latency of 30 to 50 seconds and lasts for about 10 to 30 minutes, depending on perfusion. The drug is metabolised by esterases in blood plasma and liver.

Adverse effects When used excessively, oxybuprocaine like any other topical anesthetic used in the eye and on mucous membranes (like for example tetracaine, proxymetacaine and proparacaine) can cause irritation, hypersensitivity, anaphylaxis, irreversible corneal damage and even complete destruction of the cornea. (Excessive use means several times a day during several days or even weeks.)

Interactions Oxybuprocaine is incompatible with silver and mercury salts, as well as alkaline substances. It also reduces the antimicrobial action of sulfonamides.

Synthesis

The nitration of 3-hydroxybenzoic acid [99-06-9] (0) gives 3-hydroxy-4-nitrobenzoic acid [619-14-7] (1). Fischer esterification with ethanol gives ethyl 3-hydroxy-4-nitrobenzoate [717-01-1] (2). The phenoxide ion was then prepared from potash (3). Alkylation with 1-bromobutane supplied ethyl 3-butoxy-4-nitrobenzoate, CID:13346201 (4). The product is crystallized from hydrochloric acid, and then halogenation with thionyl chloride gives 3-butoxy-4-nitrobenzoyl chloride [23442-21-9] (5). Esterification with diethylaminoethanol [100-37-8] (6) gives 2-(diethylamino)ethyl 3-butoxy-4-nitrobenzoate, CID:13346204 (7) Lastly, catalytic hydrogenation over Raney-Nickel completes the synthesis of Oxybuprocaine (8).

Illustrations

Worked examples

Example 1 — a first encounter with Oxybuprocaine

Start with the simplest possible case. Write down what Oxybuprocaine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Oxybuprocaine before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Oxybuprocaine ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Oxybuprocaine

In research: Oxybuprocaine appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Oxybuprocaine in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Oxybuprocaine is common in secondary-school and first-year university syllabi. It links to neighbouring topics 4-Aminobenzoate esters, Diethylamino compounds, Local anesthetics, so understanding it makes those chapters shorter.
In everyday life: Look for Oxybuprocaine outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Oxybuprocaine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Oxybuprocaine means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Oxybuprocaine out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Oxybuprocaine in simple terms?

Why does Oxybuprocaine matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Oxybuprocaine?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Oxybuprocaine.