chemistry

Klaus Grohe

Klaus Grohe 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 Klaus Grohe rather than just read about it. In short: Klaus Peter Grohe (born 16 January 1934) is a German chemist best known for pioneering work on quinolone and fluoroquinolone antibiotics at Bayer AG, including the invention of Ciprofloxacin. He developed a widely adopted synthetic approach known as the "Grohe method" for constructing quinolone carboxylic acids, which underpinned later fluoroquinolone discovery programs.

Key takeaways

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

Reference excerpt

Klaus Peter Grohe (born 16 January 1934) is a German chemist best known for pioneering work on quinolone and fluoroquinolone antibiotics at Bayer AG, including the invention of Ciprofloxacin. He developed a widely adopted synthetic approach known as the "Grohe method" for constructing quinolone carboxylic acids, which underpinned later fluoroquinolone discovery programs. In retirement, he and his wife established the Klaus Grohe Foundation (Klaus-Grohe-Stiftung) to support young researchers in drug discovery and medicinal chemistry.

Early life and education Grohe was born in Ludwigshafen am Rhein on 16 January 1934. He studied chemistry at the University of Würzburg, where he completed a doctorate in 1964 on the synthesis of pyridine derivatives.

Career Grohe joined the main research laboratory of Bayer in Leverkusen in 1965. After early work on organochlorine and organofluorine intermediates he moved into heterocycle synthesis for pharmaceutical research. In the 1970s he devised a new cyclocondensation strategy using o-halo(aroyl) halides to access quinoline and azaquinoline carboxylic acids—an approach that became known as the Grohe method. This methodology enabled the synthesis, in April 1981, of the fluoroquinolone antibiotics ciprofloxacin and enrofloxacin. Grohe is named as an inventor on core ciprofloxacin patents, including US 4,670,444 (reexamined as US 4,670,444 B1). Court records from patent litigation in the United States have described the synthetic route and prior steps leading to ciprofloxacin within Bayer's program. He retired from Bayer in 1997.

Research and impact According to the German Chemical Society, “nearly all modern fluoroquinolone antibiotics are synthesized using the Grohe method,” and subsequent optimization under Grohe’s supervision at Bayer contributed to later agents such as moxifloxacin and pradofloxacin. Reviews of drug-discovery history and heterocycle-based medicines also credit Grohe’s role in the origin of ciprofloxacin.

Awards and honors Otto Bayer Medal (1987), for work leading to the synthesis of ciprofloxacin; and again (2001) for lifetime achievements. Cross of Merit 1st Class of the Order of Merit of the Federal Republic of Germany (2005). Honorary title Professor conferred by the State of North Rhine-Westphalia (2010).

Philanthropy In 2001 Grohe and his wife Eva established the Klaus Grohe Foundation at the German Chemical Society (GDCh). The foundation has awarded the Klaus Grohe Prize (since 2020 the Klaus Grohe Award) for outstanding work in drug discovery; since 2020 it has been endowed with €50,000 and focuses on scientists working in Europe. Grohe and his wife also endowed the Eva and Klaus Grohe Prize (Berlin-Brandenburg Academy of Sciences and Humanities), awarded in 2003–2015 for achievements in infectiology.

Selected patents K. Grohe; H.-J. Zeiler; K. G. Metzger, "… quinoline/naphthyridine-3-carboxylic acids" (ciprofloxacin family), US 4,670,444; reexam. US 4,670,444 B1. Formulations containing ciprofloxacin and related actives, US 4,844,902.

References

External links Klaus Grohe Foundation (GDCh) The Grohe method and quinolone antibiotics (Bayer PDF)

Worked examples

Example 1 — a first encounter with Klaus Grohe

Start with the simplest possible case. Write down what Klaus Grohe 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 Klaus Grohe 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 Klaus Grohe 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 Klaus Grohe

In research: Klaus Grohe 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 Klaus Grohe 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: Klaus Grohe is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1934 births, Bayer people, German chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Klaus Grohe 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 Klaus Grohe in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Klaus Grohe 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 Klaus Grohe out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Klaus Grohe in simple terms?

Why does Klaus Grohe 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 Klaus Grohe?

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 Klaus Grohe.